This has been known - according to Symantec - since June 2003. Also according to them, removal is easy:-
" 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 } "
I take it your AV was bang up to date ??