A vulnerability in Windows XP, that MS have known about for 11 weeks, allows anyone to put a link on a website that will wipe out hard drive directories (except Windows). The source says the vulnerability is likely to start being exploited soon!
The problem only affects Windows XP, the source advises you to tell everyone you know running XP to download the service pack and update their systems.
Another site gives you a quicker solution:
Perform a search for a file on your C drive called "uplddrvinfo.htm".
Once you have found the file, delete it or rename it. Doing so will not hinder your ability to use Windows XP.