Hopefully someone can help .
I had windows 8.0 installed with no issues and had video card driver installed for my ATI card on my laptop ver 13.1
I installed the windows 8.1 upgrade and now the upgrade is using a Microsoft stock driver called Ati Mobility Radeon HD 4650 ( Microsoft Corporation - WDDM v1.1 ) instead of the AMD Driver 13.1 I run a game called second life and the stock driver doesn't play nice with the program.
this is the error
Firestorm is unable to run because your video card drivers did not install properly, are out of date or are for unsupported hardware. Please make sure you have the latest video card drivers and even if you do have the latest try reinstalling them
Ati Mobility Radeon HD 4650 ( Microsoft Corporation - WDDM v1.1 )