The good news is that your league data is probably just fine.
The bad news is that it sounds like your Windows installation is screwed up, unfortunately.
The following references Windows 2000, buy I'm pretty sure that XP works the same way:
http://support.microsoft.com/default...b;en-us;318728
...you might need to reference the following sites, since you don't have any recovery or back-up CDs.:
http://www.bootdisk.com/
http://support.microsoft.com/?kbid=310994
Whee!