It could be that pieces of the virus infection remain. If all that was done was a re-install of Windows over top, that may well be the issue. You may need to reformat and reinstall from scratch to fully resolve it.
Before you go to that drastic step, here are some Registry changes that may correct the issue:
***Warning: Performing manual changes to the Windows Registry incorrectly can make Windows inoperable. It is always advised to perform a Registry backup and setting an XP Restore point prior to making changes to the Registry.***
That being said...
Go to Start - Run (type) regedit - (right click on the little my computer icon, and export the whole thing.)
find this key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced. Go to the rightside of the window, where the values are. Find the value "Hidden" . Rightclick it and modify it to 1.
This following text is from my own registry. Copy all of the text between the dashed lines and paste it into Notepad, next rename the notepad file's extension (.txt), so it has the extension .reg ,and then doubleclick it.
(NOTE: if you do not see the file's three letter extension, go to My Computer - Tools - Folder Options and remove the check in front of 'Hide extensions for known file types' and click Apply):
--------------------
[b]Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden]
"Text"="@shell32.dll,-30499"
"Type"="group"
"Bitmap"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,\
00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,53,00,\
48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,34,00,00,\
00
"HelpID"="shell.hlp#51131"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\NOHIDDEN]
"RegPath"="Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Advanced"
"Text"="@shell32.dll,-30501"
"Type"="radio"
"CheckedValue"=dword:00000002
"ValueName"="Hidden"
"DefaultValue"=dword:00000002
"HKeyRoot"=dword:80000001
"HelpID"="shell.hlp#51104"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL]
"RegPath"="Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Advanced"
"Text"="@shell32.dll,-30500"
"Type"="radio"
"CheckedValue"=dword:00000001
"ValueName"="Hidden"
"DefaultValue"=dword:00000002
"HKeyRoot"=dword:80000001
"HelpID"="shell.hlp#51105"[/b]
--------------------------
You may also want to try this Registry change:
http://tinyurl.com/3alnwl
.
I hope this helps.
Good Luck.
.
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