Don't touch the device manager, especially the rollback function. It's bad and shouldn't exist. Go to control panel/programs and features and uninstall the whole catalyst package (all components).
After that, go to the laptop manufacturer's website, and download the drivers made for your laptop. Install them, and you should be good to go. Forget the drivers on the AMD site, they're not recommended for laptops, a lot of times they don't even work for laptops (as you experienced it yourself).
CPU: AMD Phenom II X4 810 @ 3120MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 835/1135MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 3.11 Pro x64