The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
Disable System Restore (Windows Me/XP).
Update the virus definitions.
Restart the computer in Safe mode or VGA mode.
Run a full system scan and delete all the files detected as W32.Jeefo.
Delete the value that was added to the registry (Windows 95/98/Me).
For specific details on each of these steps, read the detailed instructions on Symantec's site.
http://securityresponse.symantec.com/avcenter/venc/data/w32.jeefo.html