Windows XP SP2 I had a very nasty virus to clean. I was unable to initially install any security software (even in safe mode) until I installed WinPatrol. I was then able to see a file with a random numeric name in startup from windows\system32 which I used Unlocker to delete. After that I was able to install MBAM. It found some nasties to delete & froze on the first attempt to remove. I then ran a full scan with MBAM & also Nod32 & then PrevxEdge. HijackThis seems ok. Everything seemed fine except that I could not browse the Internet, Nod32 could use the Internet to update with no problem. I used a Winsock repair utility which had no effect. I uninstalled IE & Firefox & then reinstalled them with no effect. I set up a new user account & the new user couldn't access the Internet. Running Safe mode with Networking, the Internet worked fine. The hosts file was clean. The problem was Nod32 v4. Each time I installed Nod32 v4 it cut Internet access, I uninstalled & it worked fine. Everything is now working with Nod32 v2.7.