My Rig is about 4 years old...
Core 2 Duo 1.8Ghz
4GB RAM (well XP only sees up to 3Ghz)
1TB SATA Drive
1024 x 768
Win XP 32 bit
Geforce 9500GT (old school I know)
32" HD Sony LCD
4MB DSL UNshaped uncapped line
set on "Very High" and plays perfectly
Online play 24Hrs + no glitches, No fuss.
AND still better looking than my ps3 HD version...