The PC isnt in a fridge! Its a quad core Intel machine, about 3 months old with a good graphics card (something GTS) 4 gb memory, two hard drives 250 gb and 750gb. The freezes have happened about 4 times at seemingly random points ..once playing a DVD, once on a video edit program, and two other times when on the internet. I cant work out a pattern, and a pc of this spec should cope with heavy loads like editing video. I have Bullguard AV and adaware both up to date. Not tried the manual vista updates but will try that.
Any further clues. Oh the PC doesnt recognise all of the 4GB memory (just three) which is apparently normal if you have a large memory graphics card.