Antivirus problem

Basically i remote connected to my girlfriends laptop running xp and installed avira because she thought a virus was on the computer.
There was virus software installed but it wasnt running at the time (not in the task manager or in the system tray).

So i thought it would be ok to go ahead and install avira and do a scan. I installed, updated, scanned, then checked the boxes to look for root kits etc and did a full scan, almost 200+ .exe files appeared, not to mention alot of directories for the registry (which were ignored in the quarantine), everything else was quarantined fine, the c:\Documents and Settings\user\userdata (or application data) directories had the majority of hits.

However, after this completed and the objects were quarantined, the system had to restart. After the restart, she had no internet icons on the system try (the wireless icon and the ethernet icon with the two screens) never appeared, and there were 3 error messages one from the original antivirus software (f-secure) and another from windows and another from team viewer (the software i used to remote in).

I dont know these errors as she cant send them too me.

Is it possible the avira scan quantined some important files needed for these utilities and software?

Is there anyway to reverse what i did with the quarantined bits?

I need help as urgently as possible.

If i uninstall avira will the files return to their original place? Is there an other reason for the system fail?

Thanks

Try to use symantec anti virus from now on.. I'm not sure what to do though..Maybe try to repair the computer.. or totally reinstall windows...
- Amber,
solutions integration, enterprise resource planning,customer relationship management

try system restore or install new windows(recommended)

I think it's good to discover avira virus but not in the strike, only applies to a virus and nothing works. I have much experience with it. I know from experience that the best is avast and older version 4.0