I don't have XP installed (although I have it in my right jacket pocket, lol and I'm probably going to install it tomorrow) but is it causing you any problems? i.e. system lockup, etc.?
It might be an XP file... do you have any kind of antivirus installed?
One good way to check which works on any windows system is to just start up your computer, hit CTRL+ALT+DEL and see what's running.
If you don't know what certain programs are that are running, find out (google it).
You might also want to install ZoneAlarm. That will generally protect you from trojan horses allowing access to your hard drive since it warns you before any program accesses the internet.
Former ASP Forum
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If you can teach yourself how to learn, you can learn anything. ;)