System error. Your computer was affected by unknown trojan
2008-03-27OS Windows XP SP2.
Got call from user who was getting “system error your computer was affected by unknown trojan” error every time he would open IE browser or Windows Explorer.
User had Symantec AV running also Windows Defender.
I also had to install SpyBot and Adaware and run it.
I did scan for viruses and spyware.Everything seems to be OK, but this error would not go away.
Solution that worked for me was removing registry entry.
Please, make sure you have backup of this registry entry first.
Removing every key in the following registry key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects.
Do not delete “Browser Helper Objects” key.
Please be careful working with a registry, because you can make your computer not operational and would require reload OS.