So I was updating my drivers, and I downloaded and installed the AMD Catalyst. After all that stuff was over, I launched TF2 and this is what happened:
GPU:ATI Mobility Radeon HD 4200 Series
Driver Packaging Version 8.961-120405a-137225C-ATI
i would just reinstall the previous drivers, if it worked with previous drivers offcourse :p
Good thing windows saves your old drivers =P