Originally Posted by
peterb
If you boot into safe mode with the interactive option, you can chose which drivers to load, so you can try that to eliminate the one causing the problem - time consuming though.
(I am assuming that you have checked to make sure that there isn't any malware running in the background which could be using CPU resources.
If you suspect the Nvidea drivers, try uninstaling them (card should still work in basic modes) and see if the problem goes - if so re-installation 'might' solve the problem.
Other than that, not much else to suggest - a Windows 'guru' might have more ideas -- or more definite ideas. A Google search might help, or a look at the MS support site.