AVG Tune-Up problems

Wendy, Have a look @ this article (http://avgclick.me/restorechangesbyAVGPCTuneup).
AVG Guru

I installed AVG Tune-up a few days ago but now whenever my laptop is at rest and showing the desktop the screen keeps flashing with different, changing colours.  It stops when I press Enter.

Wendy, Have a look @ this article (http://avgclick.me/restorechangesbyAVGPCTuneup).
AVG Guru