OP- just horrible horrible purchasing decisions. You say you upgrade every three years, and yet you replace a 6 month old 7800GT with an equally old GTX that only outperforms it by a small amount and YOU DON"T GAME??? I know you already have the GTX, and you claim it was a great deal, so sell it. Sell the 7800GT as well, and buy a X1600pro. Use the $$$ to buy games for your Xbox 360 as soon as something decent to buy comes out. I know you didn't ask for my advice on the card, but then you didn't need to throw out your "The PC isn't for gaming, the 360 is" line. Frankly enjoy your crippled processor and your overheating-prone form factor. at least you can take solace in your GPU....or could have at the time of the console announcement. Arguably, PC video cards have already exceeded the GPU in the 360.
The driver install takes like 5 minutes, so yes, just reinstall them.