How to unregister a dll file in Windows XP or Vista?

A DLL file, also known as Dynamic Link Library, is a file containing different functions which are mostly used across multiple applications. In order to unregister a dll file to troubleshoot a problem in Windows XP or Vista, follow these instructions:


  • From START menu select RUN option.
  • Type “cmd” (without the quotation marks) . This calls up the Windows Command Prompt.


  • Type “regsvr32 /u filename.dll” where “filename” is the name of the DLL that you are trying to unregister.


  • Press ENTER.
  • After you press ENTER,  the confirmation window stating “DllUnregisterServer in (file name) succeeded” will be displayed.

unregister dll succeeded


Please keep in mind that this involves system modification and can be highly risky.

It’s always recommended to keep a system backup handy, in case things go wrong.

Here is an example how to unregister a file smbdlib.dll:

Video 1. How to Unregister a dll File?



  1. urgod says:

    Just to say, the guy who talked about system restore, it’s works!! Altough, you just have to make sure you go bak far enough 😉

  2. Roberta says:

    My little brother downloaded this thing to my pc, I can not get it off. I can’t go to run because that is gone now as well, any ideas? I was going to just erase my computer, but I got it from a friend and i have no back up.

  3. Nazeer says:

    Me too a visctim. I not even know I downloaded this one. When it was running what I thought was that it was a starwar between Microsoft Antivirus and McAfee Antivirus…funny in the beginning…but soon I realised that I’m trapped nicely…I’m trying to digest the all manual steps, but in the meantime I’m backing up my files as I affraid I will end up in re formating the machine only.

  4. scott says:

    im all for the lawsuit too either that or a 357 magnum or a malatav cocktail to innovagests headquarters!!! assholes like that should be SHOT!!

  5. Barry says:

    People you are allowing these idiots to rule your life?????
    After you backup your docs and crap on DVDR or USB drive. DO A RESTORE (DESTRUCTIVE) which means format the hard drive.
    Badda Bing your done in hours…..Now the next time your backup will take even less time, because you already have most data backed up, so 2 hours and your back up, for the rest of your life. DONT LET THESE DORKS TAKE ONE MORE SECOND OF YOUR LIFE. This includes norton and all so called antivirus products.

  6. Louis says:

    I’ve tried about almost everything and with no luck.

    I haven’t tried a reformat but from what I’ve been reading it probably wont work.

    Also, I’ve heard somewhere that programs could be stored on that battery thing that keeps the time stored.
    It’s that wrist watch type battery on the motherboard. Take that out and try the reformat.
    … maybe that’s how it keeps coming back?
    Who the fuck knows.

    I’m all for violence against the people who created this thing.

  7. ross says:

    go to the task manager and end the program, the go to my computer/c:/program files/ and look for a name that stands out. i think it starts with R?

  8. Gordon says:

    Read up on it. It is easy if you follow the steps. If you have paid them from a visa card, cancel the payment through visa.
    Ya dumb asses.

  9. Tiffie says:

    Wow….Someone was able to do a system restore? All my restore points have been deleted..I am unable to go to any antivirus redirects me to spyware/adware pages instead.. I am also unable to boot up in safemode..

  10. D Patterson says:

    Hi All, I have had this stupid Antivirus 2008 on my computer and have been unable to delete it. I bought Kaspersky and downloaded it and ran the scan and even contacted support and they were unable to help me. Please if anyone has anything that works, and doesnt jack my computer up even more, please help me! As soon as I cut on my PC I get the annoying blue screen that says ““Warning! Spyware detected on your computer”, when i put in “regsvr32/u filename” it says…
    “file.dll was loaded, but the DllUnregisterserver entry point was not found. Any help, please email me at

  11. Dawn says:

    I cannot get this off of my computer! I search for the files and they are not found. Please help!

  12. Hope says:

    I have tried unregister…not found, find n delete…not found, remove…not found, but virus still detected. I tried system restore, but can not, only restores to the time the virus was downloaded by my husband… We never clicked on agree and install with the anivirus XP 2008 license agreement though…REALLY ticking me off…HELP! PLEASE!!!!

  13. Paul says:

    Post 149 was very helpful. I was able to remove it quite easily after reading it. However, you have to browse through your program files to find out what the virus is hiding itself under. It named itself “3” in my files…not Antivirus XP 08 or anything like that.

    So, if you see any program files you don’t recognize…click on that…and then follow the easy steps in post 149. thanks for your help everyone.

  14. Linda says:

    Help!! Got the virus. Can’t find it anywhere. it is eating up everything. can’t get online, can’t access task manager. HELP!!!!!!!!!!!

  15. michael w. fuller says:

    live in los angeles, ca. every 5 weeks i have to deal with a serious virus, but this one takes the cake (or my computer). i’ve read where someone would like to kill this person, i say no let him rot in maximum security prison with laxative in their food, every meal(for reasons that they killed my computer with their stupid virus)
    i’m stuck in a wheelchair and my ears ring 24/7. (cerebral palsy and tinitus, nine tears and ciunting.)and no freinds to speak of and the family doesn’t want anything to do with me either, and at 51 1/2 amost 52 by less than two months well, wake up fool and get with reality, would you like to deal with all i’m dealing with??? i could go on and on but i’ll stop here for now.
    eternity well i got some news for the so and so, you opened a bad door that you can’t return.

  16. ANGIE says:

    Dear Mark.
    I have been trying to remove this death trap for about 1 week straight i have been trying to go through the different directions and nothing works. I can get the pathetic blue desk top and i can’t download the McPhee that i get free from comcast. I have had 2 back surgeries and this sittin in front of the computer is killing me.

    Is there simple directions, hard drive toooo heavy to carrie to someone to fix it.

    I can’t all the .dll’s i found say it belings to dell. i dont know what to delete, and also i did find some files that look rediculas but the warning is still there, everyone wants money to download removals, i don’t have a charge card. Anyone, anyone thanks

  17. bj says:

    can anyone direct me to the creator of netbooster I would like to meet this idiot and then torture him for extended periods as not only have I had to reimage but also I have lost important client information and have been forced to repeat my tafe diploma which I had almost completed as major assignments have been lost in the process and still this crap is affecting my system I have tried everything listed here as well as reimaging.

    If noone can direct me to the actual person then just an online alias will do

    Also any other removal suggestions would be highly appreciated

  18. naima says:

    my computer keep sayin that task manager has been disabled by the adminstrator but I am the adminstrator how do i fix this?

  19. Diane says:

    Can you help with this? I get the message: The module “filename.dll” failed to load. Make sure the binary is stored at the specified path or debug it to check for problems with the binary or dependent .DLL files. The specified module could not be found.

  20. sw33ty says:

    Thank you Mark (:

  21. Karen says:

    I just got the virus “Antivirus 2009.” Is it the same as AV2008? Same procedures for deleting it?

  22. Christy says:

    My computer keeps saying “Blah has been disabled by your administrator”.. I’m the only profile on my computer.. when I try the Start>Run>taskmgr and also use the Start>Run>regedit.. most of the instructions on how to fix this problem require me to be able to access these places.. but I cant.. can someone give some advice on how to enable the task manager and the registry edit?

  23. HRW says:

    I ‘ve got this Trojan.Zlod.Worm.Apache had all the windows that you show on your page above. This was despite having Avast, spybot and ad-aware installed. In safe mode everything seems OK but in normal start up mode I can’t use any of the ‘icons’ after pressing the start icon all my desktop icons disappear for a few seconds and then reappear but I can’t open any of the programmes, control panel, internet etc. I’ve installed and run Norton 360 which has got rid of the blank windows that kept on appearing and the warning that I had a security problem. However, I still can’t use the icons after clicking on start icon. I looked at the list of .dll files and found that from the list printed on one of the xp/how to unregister dll files web pages that I have pmspl.dll and msvideo.dll. I’m not sure whether or not I should do anything to them as both of them are on my kids computer and there are no problems with it. HELP

  24. HRW says:

    audrey july16 you are a star. Your advice worked. If only I had found your blog 2 days ago!

  25. tenzack says:

    This Procedure clearly not shown over the forum
    Quickpost this image to Myspace, Digg, Facebook, and others!

  26. gregory says:


    When I am starting my system I got 2 notices:

    Error loading c:windows/system32/wvUnLETn.dll
    The Specified module could not be found.
    Error loading c:/users/xxx/AppData/ Local/Temp/fiuhguft.dll
    The Specified module could not be found.

    What does it mean and how can i get rid of that?

    Thanks for You help.

  27. Vicky says:

    I have more than one of each shlwapi.dll and wininet.dll file. Do I unregister all of them? Also, why is it necessary to unregister before deleteng?

  28. eli says:

    my one is saying how they cant find the file what shall i do

  29. eli says:

    actually it is saying how they do not recognise the ‘c:\’

  30. Abby says:

    i can not seem to be able to locate my dll file as i can not change what comes after the c:/ as it is not letting me change this what shall i do??

  31. Ryan says:

    How Do I get rid of this Antivirus 2009 on Vista for free. Is it a long process or should I buy somehting to remove it?
    Thank You for anyone help!!!

  32. satish says:

    thanks. it worked very well

  33. maity says:


    In my case, when I run an anti-virus software it shows a registry keys pointing towards hulifeki.dll and govebosa.dll (the latter of which gives me an error message on boot up saying cannot be found)

    Now neither of these can be found in the system32 folder where they are supposed to be located, or for that matter anywhere else on c drive, yet I am still getting the annoying pop-ups!

    Moreover, when I try to un-register hulifeki.dll, it says it was “loaded, but the DLLUnregisterServer entry point was not found. This file can not be registered.” the other one simply can’t be found.

    Please help.


  34. sana zahara says:

    Thanx for Audery (16 July) i followed ur instruction and it worked for me. Cheers!

  35. Nathan Aguru says:

    Couple of days ago “spyware guarde 2008” downloaded itself into my hard drive and since then I’ve been trying to delete this sucker and it kept on downloading more of it’s self. I need help.

  36. Doc Zeremba says:

    I am stuck at step 2 where it says to type in the file name. How the heck do I know the file names? Are they “shlwapi.dll” and

  37. Wayne says:

    Did you ever get the spyware guard 2008 uninstalled. It is really getting on my nerves.


  38. Greg says:

    Sounds like you have a Vundo trojan visiting for the holidays. Google for help and kill it as soon as possible.

  39. laura says:

    Okay guys. I’ve tried everything. My next option is throwing it off the roof of my house. I’ve done the C:\ windows\ system 23 and all that fun stuff. I’ve deleted it manually. I’ve tried it all. It just keeps giving me that “file cannot be deleted” bs.

    Is begining to look like the only future for my computer at this point is a long fall with a hard landing.

  40. asan says:

    i have this spyware i did know ow to remove it
    can enyone help me?????

    System Volume Information\_restore{98DF0744-E9D0-4D5D-BAFF-085C137ADB1B}\RP197\A0118699.exe »NSIS »NSISSpywareSecure2.dll – Win32/Adware.SpywareSecure applicazione

  41. Kyle says:

    Yes Laura, I just had the same problem…its real easy to fix, go up the page and read kevins response, all u have to do is drag the file to desktop, right click on it and rename to (the file. doc). restart your computer and then drag to the recycle bin..

    Good luck

  42. Park says:

    under what the name of file is antivirus 2009 hiding

  43. billy says:

    How do you go to the cd root?

  44. billy says:

    Seriously, someone should track those bastards that created the spyware and either KILL THEM or SUE THEM!

  45. dave says:

    k got this antivirus 2008 thing that most of u r talkin bout. read how to manually delete it..but cant do any of the things im suppose to do. cant open taskmanager, wont let me. says its been shut off by administrator. cant open C harddisk says reclyedboot32 etc. dont know the dll or w/e so dont know what to type in the run command.

    any suggestions?

  46. dave says:

    got my taskmanager back finally, but how toidentify the correct process to dlete? how to know what file name to type in the run command?

  47. shella says:

    i have this virus detected from norton its Trojan.Brisv.A!inf that requires manual remaval. please help. thanks

  48. ian says:

    i trid your method but i when i am deleting it says access is denied
    i was trying to delete a shlwapi.dll file and a wininet.dll file both of them access denied and in the windows system32 folder

    any ideas?

  49. jason smith says:

    get the fuck off my computer

  50. polo says:

    I agreed with your assesstment in regards to DLL’s however what do you do when you have a black screen with the the DLL’s message and you can’t reboot? Since I can’t get to my start button due to my black screen, what command do I use to get it to a run mode?

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