benohit

(sorry for my english) hello !!! i'm a network administrator, and i've got problems on computers : here it is : a computer ( with windows xp home installed on it ) infected by an "unknown" (by me) virus can't resolve dns addresses anymore... When i try to ping www.google.fr or any fqdn address, it doesn't seem to find it, but it pings ip adresses like my router : 192.168.1.1... or public addresses too... Anyone knows about this i how could i disinfect this computer please ? i installed the Windows XP SP2 on it and it runs AVG as an antivirus... it was scanned with avast too, but the problem is still here...