Then I ran the Device Manager and discovered that my "ATI Mobility Radeon HD 3400 Series (Microsoft Corporation WDDM 1.1)" have the status of: "this device cannot start. I couldn't find any possibility to my ATI graphics card pre-loaded, I could do before. Mobile Intel(r) 45 Express Chipset Family (Microsoft Corporation - WDDM 1.1) I already made sure I use my laptop on the 'Best Performance', as usual before the upgrade. Some games like the Sims 3 and Left 4 Dead can be played, but they were choppier before the upgrade. Left 4 Dead 2 could not be played at all. Everything seemed to work fine except one thing - the graphics. I recently upgraded my Lenovo ThinkPad T400 Vista Enterprise OS to Windows 7 Enterprise (32 bit). ATI Mobility Radeon HD 3400 Series (Microsoft Corporation WDDM 1.1) driver for Windows 7?
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