Hello
If you do not have a service pack on Windows XP it is very possible the computer is infected.
Please read: UPDATED WINDOWS - Your first line of defense, links and tips
Automatic Updates is usually enabled by default, did you change the settings? How long has it been since you updated the operating system?
Using Windows Update for Windows XP
http://www.microsoft.com/windows/dow...windowsxp.mspx
Windows XP has a native firewall, please check to see if it is enabled.
Tutorial with pictures: Windows Firewall
http://www.theeldergeek.com/windows_firewall.htm
Best regards.