I agree with the l'Zar. I am running a 4 year old MoBo & CPU, 4 gigs on Win 7 x64 (4 GiB useable for you 64-bit geeks :P ) and a Vid card three generations old (ATI 4850). Runs games very well and other apps (photoshop, inDesign & productivity) very well. CPU/GPU tech has moved forward the past 4-5 years, but much, much slower than in the past where a rig was likely outdated in 18 months and hardly able to run current games at the crappiest settings within 2-3 years. Even mainstream 3D cards have enough punch now to last a while.
D>M>