Always, enable the Internet
Connection Firewall in Windows XP.
Download and apply the patch MS03-039 here:
[A Buffer Overrun in RPCSS Could Allow an Attacker to Run Malicious
Programs]
http://support.microsoft.com/?kbid=824146
More Information - "Blaster"
Worm
A tool is available to remove Blaster worm and Nachi worm infections from
computers that are running Windows 2000 or Windows XP:
http://support.microsoft.com/default.aspx?scid=833330
Learn more about Firewalls - Windows XP ICF:
http://windowsxp.mvps.org/firewall.htm
Virus Alert About the Blaster Worm and Its Variants:
http://support.microsoft.com/?kbid=826955
What You Should Know About the Blaster Worm
http://www.microsoft.com/security/incident/blast.asp
TCP and UDP Port Assignments in Windows 2000:
http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/tcpip/part4/tcpappc.asp?frame=true