I did originally think it was a virus and Sian had done something while I was in worm. Noticed some bits not usually there, htcpassthru, or something similar and another exe. They both seem genuine though and it keeps doing it after stopping those.

Aye, won't work on system. And its only one one core most of the time anyway. I will have to do some investigating when I can be bothered.

I unplugged some USB stuff and all is fine now. Possibly my monitor or the dodgy USB 3.0 ports on the back of the computer.