Over the last couple of weeks, my PC has started to reboot itself randomly and for no apparent reason that i can see. I first noticed it when i used to leave it on over night when i was burning DVDs, i would come down in the morning and the PC had rebooted itself and it was during the burning process and thus my DVDs never finished burning. So i thought it might have something to do with the Nero software i was using, so i reinstalled it all and it looked like it had stopped rebooting. But now it has recently just rebooted itself when i havent been burning, so it cant be Nero. I would just be on the internet and doing somethign and then it would reboot itself. The only thing that has changed recently since this started is that i have installed a new Graphics Card. I used to have a Radeon 9800 Pro (128mb), but now have a Radeon Sapphire X1550 (512mb). The drivers for this are all up-to-date.

I have de-fragged my PC since this started, i have run a few spyware programs and other cleaning programs, but still it does it. I have Windows XP Home. I have never had this problem before. I have even looked in the event viewer to see if something shows up there ad the only erros at the time of rebooting are the following:

Error - Source - AVG7 - 2007-11-16 12:59:03, 593 VOYAGER [002100:002727] ERROR 000 AVG7.CC plugins. CAvgCcPlugin plugin refresh failed: Error 0x80004005

And there seem to be a ot of these erros in the event viewer, so could have something to do with my AVG Free Adition virus, but if so it has never happened before and i have had this virus scanner on my PC for nearly a year now if not more.

Can anyone help me as i have no idea why this is happening.

If u need any other information then please ask and i will try to provide it.

Thnx

Razor