Do Option 2 of this tutorial SFC /SCANNOW Command - System File Checker
it will not harm any data or programs you have installed it will try to find and repair any corrupt system files that you have.
Click on start button
in the search box type Aero
and look for Find and fix problems with transparency
and check for problems.
Attachment 239622Attachment 239623
Click on the Start Button
type in Services
In the search box and then click on Services
Scroll down until you see Desktop Windows Manager Sessions Manager
select it in click on the Stop
text and let it stop after that click on Start
text and see if that works. Your screen may blink when you do this.
Attachment 239625Attachment 239626
PS don't use tuneup utilities again