I am running ITunes 4.8 on a windows media centre PC. Quite often if I load a CD into either DVD/CD Drive the PC simply restarts. this does not happen all the time but enough to be annoying

Any help would be much appreciated

Roughly how long has this been happening?

Try and change your IDE cable that connects to your DVD drive and see if that helps.

Have you tried scanning for spyware/viruses?