Excellent reply, thanks for all the information.
I tried everything on the list in the order stated. The scans didn't detect anything, i had run a couple about a week ago so was pretty clean. After i cleared the old restore points i left my PC on over night, when i came to it this morning it had frozen again. Any suggestions?
I have recetnly reformatted everything i had that connects to my PC, both external HDD, USB stick even my iPod just in case. I don't see how anything could still be around after that.
I've run check disc, memory checks, do we have many options left? Are there more diagnostics i can run?
I really appreciate all your help so far.