I ran q2 on a pentium 2 with an ok vid card for ages, and really don't notice an improvement on any of the machines I've used since.
if you only want to play Q2 why even consider upgrading?
WHat level is that? Also, Download?
I will assume your motherboard won't allow it, but you could always overclock your CPU. I think those E5200 chips commonly overclock to 3.2-3.5 GHz, perhaps higher if you're lucky. It would be plenty safe, and it's FREE, that is IF you have a motherboard with those capabilities. You say you have integrated graphics though, so I'm guessing this was a pre-made machine bought at Best Buy or something like that? In that case you probably don't have any OC'ng options.Do you know the make/model of the integrated graphics processor?