If you don't have any updated Virus Scanner you may try using the McAfee Command Line Scanner. Follow the these instructions to scan your computer for Virus Infections, no need to install the Anti-Virus just download the latest Virus Definition File and scanner and scan your computer
Here we go :
Download the File named Sdat----.exe from the following location :
ftp://ftp.nai.com/pub/antivirus/superdat/intel/
Create a new folder SCAN on on the root of ur C:\ drive and copy the file to this new folder.
Boot your machine into Safe Mode.
(
http://www.pchell.com/support/safemode.shtml)
Now open command prompt and go to C:\
Cd Scan
Extract using the command
sdat####.exe /e (replace #### with version number)
Do DIR and make sure u now have a file Scan.exe there, if the file is there now run the following command.
SCAN.EXE /adl /sub /clean /del
adl scans all local drives
/sub will scan all subdirectories
/clean will clean any infected files
/del will delete any files that can't be cleaned
If you need the command parameters listing type scan /?
Omitted or add any commands that you want.
This will clean all infections detected on the machine, I've presonally found this scan very effective and the fact that u initiate it from command Safe Mode allows it to clean thoroughly.