Win32 Trojan-gen UPX

Got this virus. Win 32 Trojan-gen UPX
I have Windows 98
Located
File name system.exe
folder C:Program Files/Internet Explorer
Any help would be appreciated on how to delete it
Thanks

It sounds like an SDBOT or irc Worm. check the file by using this link:
http://www.kaspersky.com/remoteviruschk.html

Maybe you are able to rename the file and restart the computer?