My desktop PC, running windows xp, has started to shut down and imediately restart at random intervals (sometimes the fan runs loud, others it doesn't). I initially assumed I was running too many programs at the same time so tried starting up in safe mode and leaving the machine on with nothing running...... it still shut down.
My son suggested that the processor was overheating and he put some gel stuff on it for me. The old stuff was chalk like and crumbled off. This didn't help.
I'm not sure if this is a hardware problem or maybe a virus, so appologies if i'm posting in the wrong place.
Any help would be appreciated, i'm a bit out of my depth with this technical stuff and hope i've not left anything vital out.