Windows XP restarts itself suddenly

"It sonds like you aer getting a Blue Screen Of Death and you have the Reboot on Blue Screen option turned on. I would suggest updating all your drivers as a first step. You can also look at the dumop file (C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\WER811d.dir00\Mini090909-02.dmp) but erading those can be something of an esoteric art. I have heard of an app that will analyze a dump file for you but I don't remember the name off the top of my head. I'll see if I can find it.

So, the software that I was thinking of is WhoCrashed. I have not used it myself but I have heard other people mention that it is useful."