Radeon HD 6870 not working with Blender

so I’m using a Radeon HD 6870 graphics card, with the latest drivers. Blender works fine, untill I change Screen layout to UV Editing. As soon as I do anything with the User Perspective while in the UV Editing layout, the graphic drivers stop working and restarts, which leads to Blender crashing.
I’m running Windows 7 Home Premium 64-bit, and I’ve tried with both the 64-bit version of Blender and the 32-bit.
Any help?