Reptile, you don't exactly NEED to upgrade anything, I just wouldn't expect amazing performance in AVP. It'd probably run, just not very well. In your case it's not a simple case of upgrading one thing and suddenly it'll all be amazing maxed out. If you want to max out this game, you'll probably have to upgrade a bit of everything. But if I were you, I'd get a new graphics card first - have a look at the GTX260 series, they're not too expensive, and leagues above an 8600. That should at least get it running at pleasant graphics settings. )I'd also consider more RAM if I were you). I'm no expert though.