Simple answer:
in qt-player:
file / open recent / clear menu
Tougher answer:
Go to START/RUN type in msconfig, then uncheck the qttask.exe start-up program.
Hope this helps.
System Idle Process should be running 99%, with nothing else running.
Try clicking on "CPU" to sort by cpu usage.
You should see something like:
System Idle Process 98
Mozilla.exe 02
System ...