Press Ctrl+Alt+Delete (all at the same time), when the next screen comes up select Task Manager. With the processes tab showing Click on the CPU column header, this will sort the list by percentage of CPU used. This will show what processes are using most of your CPU. The Performance tab is useful also.
Thank you. I will do that.
CTRL+SHFT+ESC does the sends you straight to the task manager (skips a step)...