I spoke too soon! 1 reboot later and the CPU is back to 100% with the mouse pad not working
. I've run the ESET antivirus but it hasn't found anything. Interestingly the antivirus was able to use as much CPU as it wanted, so whatever is hogging the CPU must be of a low priority. The keyboard still only works at about 1 keypress per second so this has taken ages to type!
Vindaloo