explorer.exe application error 0x00000000 the memory could not be read

i have windows xp with sp3 and i recently got a virus and used pctools spyware doctor to remove it.  the virus was successfully removed and i used tuneup utilities and ccleaner to clean the computer up.  now the problem is when i right click on a file (not a folder) to attempt to copy and paste etc i am getting the explorer.exe application error 0x00000000 the memory could not be read and everything clears from the desktop when i close the error box. most of the time it all comes back in a few seconds.  if it doesnt i have to use task manager to open explorer.exe again
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There could be some system files corrupted. Try to repair Windows with installation CD - http://pcsupport.about.com/od/operatingsystems/ss/instxprepair1.htm
Whole bunch of stuff to try.

First, schedule a disk scan (Open My Computer, right-click your hard drive, select Properties, switch to Tools tab, press Scan Now button under Scan Disk for Errors, and schedule a scan to fix errors automatically.

Windows will prompt you to set a scan the next time Windows starts. Do it and restart. Allow the disk scan to proceed. Might fix the problem.

Then rebuild the icon database. Right click an open part of your desktop. Select Properies. Click the Appearance tab. Click the Advanced button. Select Icon from the pull down list (it shows Desktop when you switch to appearance).  Change the point size of Icons up or down one point (the default is 32). Click OK to exit the Advanced window. Click Apply to change all the icon sizes (and recreate the Icon database). When it finishes, go back to Advanced, select Icons, and change the point size back to the 32 pixel default. OK, Apply, and your done. Exit Properties.

Now, go to www.majorgeeks.com and download Spybot Search and Destroy and Malwarbytes (they are under the Anti-Spyware column on the right of the window. It is in alphabetical order). Install them, and update them.

Then, restart your computer in SAFE MODE. Run a complete Spybot and Malwarebytes scan, and let them fix any bad settings they find.  

It is likely the malware changed some of your Windows settings to make your computer less secure and more annoying. The safe mode scan with Spybot and Malwarebytes often fixes  that.

If you're still having problems, there is plenty more you can do, but this is a good start.

Good Luck!
Check the follwing in the registry......

"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"

Make sure that nothing is jacking with the SHELL value, which should be Explorer.exe
Also, make sure that the UserInit value is "C:\windows\system32\userinit.exe,"

Also check to see if a subkey exists under here called....

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\explorer.exe

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Honestly, because of the erratic nature of some viruses and the things they often leave behind, it's always safer to reformat a system. I'm sure it's been said a million times, and it's never easy to do, but it will almost always improve your system performance and you'll have peace of mind that there are no traces of any virus activity on your system (until you get your next virus of course).

This is espically important if you use this computer to do anything like online shopping, banking, etc. If there's still some leftover backdoor or other malware that your programs havent detected, then you leave yourself exposed. Dont get me wrong either. I love MalwareBytes and Spybot.


The time it takes to install, update, boot into safe mode, scan with both, repair, and scan again is usually about the time it would take any decent computer guy to backup your personal files and re-install Windows. Ninite.com to re-install programs and you're practically good to go.
jughead8Author Commented:
I opened HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe and explorer.exe does not exist and also HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\explorer.exe and explorer.exe does not exist. can you explain how i can make those exist again. thanks
jughead8Author Commented:
i checked on another xp pro machine and explorer.exe does not exist on either of these registry keys either but that system works fine.  are we sure explorer.exe is supposed to be under those registry keys?
Its not suppsed to be under the Image File Execution key, that loads another file in it's place usually. The other one is not critical. It can be there or not. It allows a full registered path via the RUN dialogue, so you dont have to type  full paths... Sometimes also a place for hijacks....
Did you verify the File Size/ Date Modified of Explorer.exe
jughead8Author Commented:
can i copy explorer.exe from another working computer to the one thats not?
If it is the same version/service pack, yes, usually....
jughead8Author Commented:
yes it is
jughead8Author Commented:
i have used spybot and malwarebytes with the pctools and all malware and viruses have been removed.  it was initially avg free that attempted to repair the virus and i think it was avg that messed everything up as it has so many times before.  i can try copying explorer.exe from another computer with the same os and sp3.  i will use my xp pro cd and press R for repair and hope that i can access my usb stick to copy explorer.exe to the windows folder
jughead8Author Commented:
copied explorer.exe to the corrupted computer and everything seems to work great now.  thanks to all

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jughead8Author Commented:
i think there is different ways to fix this problem each with its own  difficulty...but in my situation i chose my own solution.
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Windows XP

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