Blender Sculpt Tools Won't Work. Plz Help!

Like the title says, my Blender Sculpt Tools Won’t Work. They used to work, but now they don’t. I’m using Windows 7 with a MSI N460GTX Hawk graphics card. I have both Blender 2.49 and 2.57 and the sculpt tools won’t work in either program. I found a few forums on Google that said that it could be a graphics card related problem and to download a different catalyst, but I’m not sure what that even is, plus they were using ATI graphics cards so I’m not sure if that would even fix the problem for me. My other thought was that maybe I need a different version on Python, but since the sculpt tools used to work perfectly fine I doubt that’s the issue. I’ve looked everywhere for a solution to this problem. If someone could send me in the right direction I’d be very very grateful. Please help…:frowning: