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Try hitting ALT-CTRL-DEL Once... ONLY ONCE !
This brings up a 'Windows Task Manager'.
Click on the 'CPU' column to order the processes by CPU demand.
You should be able to glance and see what, if any, it taking too much CPU time. You should normally see the 'System Idle Process' runing about 92-99 percent. Running other normal applications should run at at 1-7 percent if idle unless they are games, applications processing in background etc...
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