It sounds like a Win7 issue. When you reinstalled it.....did you fully update it? Goto Windows Update...check for updates. If it does not say "There are no more updates for your computer"....you are not current. Keep updating until you are given that message. No AMD graphics driver will install/work correctly unless this is done first.
If you have a problem updating Win7, read this > Windows will not update after a fresh install
These are the latest drivers for your laptop > Mobile (full version)
Here's how to install them > Laptop graphics update...How to (follow the Intel/AMD guide)