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Thanks! I followed a link in the thread which contained a registry fix that solved the problem immediately. Here's the page in case anyone else has this issue; check under step 4 for the solution I used. Nikhil's Notebook: NVidia Graphics card, display brightness not changing

I have an Acer Aspire 8930G with Windows 8.1 x64 and Windows 7 x86 as a dual-boot. I use 8.1 as my everyday OS and only boot into 7 to play older games that only work with a 32-bit OS. Ever since I installed Windows 8, I have not been able to adjust the brightness of my screen. Note that this...