Any computer becomes "slow" in 2 years. Reinstalling your OS, clearing out dust from inside the case and upgrading ram would help it run faster I suppose. I say reinstall your os and update your drivers too.
But if you insist on getting a new pc, pick out good parts. Get a pc store to build it for you instead of going to best buy or dell.
Here's my build, in general:
Gigabyte motherboard... EP45-UD3R
Core 2 Duo T7400 (or above if you wish)
Corsair 500w power supply
radeon hd 4850 or hd 4870. go for sapphire or HIS versions of this chipset. a dual slot solution is better.
3 or more gb of ram... if you're running xp 32 bit it'll only recognize 3.25gb, 4gb would be good for the future windows 7 would probably recognize all of it. (not sure about vista). Make sure you get ram that runs
at 1066mhz, or more if you wish (depends on whats the max your motherboard can handle)
as big a hard drive you want.
This build certainly isnt top of the line but it runs all games very well (crysis runs on medium settings but it looks great) at high resolutions too. Also, mine is very quiet and runs around 40C.
However, like the above poster said, it's weird you can't run Sims 2. It would probably run if you reinstall windows.
Edited by huxtona, 20 July 2009 - 08:13 PM.