Bertison said:
This problem originates from the fact that, as you state in your original Post, you " uninstalled your old Drivers to install new ones". I did that, a long time ago, and hit the same problem you are having.

AMD/ATI Catalyst updates do not work that way. Catalyst updates always look for the previous Drivers, uninstall them if they are older than the Update, and install the new ones, without a hitch. I have a PC with an AMD Radeon 6770 and a laptop with a Radeon 5450 Mobile card. All Catalyst updates have been carried out just as I say, for the last 3 years plus. And I have NEVER used the manufacturer's Drivers - always AMD/ATI Catalyst ones.

I think you need to find and kill all traces of any Graphics drivers. Then power off, wait a while and switch on. Windows will tell you that you need Drivers. It will look for them. If you can get the Windows Drivers, use them. At the next instance of AMD asking if you want a Catalyst Driver, let it go ahead. Do not uninstall the old Drivers - Catalyst will do that.

Think about it - Acer, the manufacturer, has Drivers, but does not manufacture them. AMD/ATI actually does manufacture them. Not only that, it upgrades them regularly. Who is going to have the best & latest drivers for you?
Yaaaa, I don't know how to do any of what you just said^