Well I have Norton Systemworks to sort that out. I run system scans regularly.
I think it may have been due to the latency setting in my bios, and the scan I did with Norton's WinDoctor. I tested it out by installing Red Alert 2. Before, it only got up to about 2% on the installation, now after doing these two things, it seems to have fixed it and now I can play this beautiful game in all it's glory.
However, it does still crash when watching movies. Again, my mind is on the cause being a conflit between codecs, but I go into Device Manager and it tells me everything is fine. :/
Thanks.