Opening CCleaner causes the computer to re-boot

Upon double clicking the CCleaner icon on the desktop, the application appears for a few seconds and then the computer re-boots by itself. I'm running windows XP, CCleaner version is 5.04.5151

Tried to un-install and re-install, didn't help.

See if this post helps:

http://forum.piriform.com/index.php?showtopic=43313&p=260996