If you had trouble re-installing / upgrading Catalyst control center, it sounds like you need to use a http://www.drivercleaner.net/type program to completely get rid of the old version before upgrading.
Have you tried calling Acer tech support? is it still under warranty? maybe your GPU is seriously defective and needs to be replaced.
If you suspect dirt or dust is the culprit, you can open up your laptop to check the motherboard. Any "dirty" areas can be cleaned with compressed air (make sure to hold it upside down at an angle so the dust falls out) or even worst case scenario with a q-tip dipped in 99% Isopropyl alchohol and then air dried. I have no technical repair skills whatsoever, but from following a couple of YouTube videos, I once successfully repaired a laptop that got damaged from liquid spillage.
Also, in general, you will likely find vastly improved performance on your laptop by upgrading RAM to 4GB or more and/or upgrading your hard drive to SSD. If your laptop is dual/quad core and you have not already done so, you will also see huge benefit from upgrading to Win7 64-bit.
some nights I create a funnel of air, and my computer is cooled by the wind that blows down from the Pennines.
Umm... I don't even want to know how you are creating a funnel of air from your Pennines :shrug: