Zotob may affect XP Service pack 1 systems
There’s an eweek article indicating the zotob family of worms could affect Windows XP SP1 systems as well as the Windows 2000 systems that are currently affected. Since the original outbreak it’s been reported that there were certain circumstances that an XP system could be compromised, this seems to back that up.
Microsoft has released an advisory on the matter entitled “Clarification of Simple File Sharing and ForceGuest”
Workarounds for the situation are SP2, install the PATCH, or three , if your a member of a domain then this will not affect you (domain members can’t do Simple File Sharing.)