For some weeks now, I have been experiencing choppiness in graphically demanding games such as Half-Life 2 and its various mods, as well as Oblivion. Now this all seemed to start right after there was a power outage at my house. I did not have a UPS or a surge protector at the time. Other than this however, my computer seems to be fine. The problem may not even be related to the power outage, but I thought I should mention it. Prior to this, these games ran fine so long as I did not set the graphics settings too high. The way things are now, it can get choppy even with fairly low settings that my computer can easily handle. I think that if a piece of hardware was damage then the computer would let me know in some way. I have also tried error-checks and defrags. I have plenty of space on my hard drive. So I guess I am just asking what this could be due to, since it did not happen before. Does this sound like a problem caused by a power outage? The only other possibility I can think of is that it could be Vista, which I have heard is not the best OS for gaming. However, as I said, these games were running perfectly well before. Thanks. My computer has Vista, an NVIDIA GeForce 7600 GS 256 MB videocard, 4 GB of RAM, and an Intel Core 2 Duo Processor.