wow, unifex, that made a dramatic difference!
I'm glad you're making progress.
If I were you, I would also disable that "wisptis.exe", that may also consume resources, although most likely it's not related to your CPU usage problem. This is a "pen input" stuff for Tablet PC. As far as I understand you don't have a tablet, right? In this case, I would go to Control Panel -> Programs and Features -> Turn Windows features on or off and remove the Tablet PC features (just un-check the box next to Tablet PC Components). To be honest, I am not sure why these are always turned on by default in desktop and laptop PCs that have nothing to do with tablets.