The processor is good, but it has probs with the RAM and graphics card.
You really need 2 GB of RAM if you want your computer to perform, especially if you've got Vista. As to the graphics card, the 8600 GTS is made obsolete by the 8800 GT and the Radeon HD3850. The HD3850 is in the same price class, but outperforms the 8600 GTS with ease.

Also an 80 GB hard drive? That is a surprisingly small hard drive and I'd recommend you to avoid one that is that small. Hard drives are quite inexpensive these days and you shouldn't settle for anything less than 200 GB.

This is a computer that is pre-assembled right? You should look into assembling it yourself of components of your choosing, it is definately worth your time and energy, because that way you can get an computer that is built according to your needs.