FOR WINDOWS XP
Windows XP (Service Pack 2)
2.0 GHz P4 processor or equivalent
1 GB RAM
At least 6.5 GB of hard drive space with at least 1 GB additional space for custom content
128 MB Video Card with support for Pixel Shader 2.0
FOR WINDOWS VISTA
Windows Vista (Service Pack 1)
2.4 GHz P4 processor or equivalent
1.5 GB RAM
At least 6.5 GB of hard drive space with at least 1 GB additional space for custom content
128 MB Video Card with support for Pixel Shader 2.0
For computers using built-in graphics chipsets, the game requires at least:
Intel Integrated Chipset, GMA X3000 or above.
2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent
0.5 GB additional RAM
SUPPORTED VIDEO CARDS
NVIDIA GeForce series
FX 5900, FX 5950
6200, 6500, 6600, 6800,
7200, 7300, 7600, 7800, 7900, 7950
8400, 8500, 8600, 8800
9600, 9800, GTX 260, GTX 280
ATI Radeon™ series
9500, 9600, 9800
X300, X600, X700, X800, X850
X1300, X1600, X1800, X1900, X1950
2400, 2600, 2900
3450, 3650, 3850, 3870,
4850, 4870
Intel® Extreme Graphics
GMA X3x00 series
Laptop versions of these chipsets may work, but may run comparatively slower. Standalone cards that are installed in vanilla PCI slots (not PCIe or PCIx or AGP), such as some GeForce FX variants, will perform poorly. Intel integrated chipsets featuring underclocked parts will not perform adequately.
Integrated chipsets such as the ATI Xpress and the NVIDIA TurboCache variants will have low settings selected, but should run satisfactorily.
Please note that attempting to play the game using video hardware that isn't listed above may result in reduced performance, graphical issues or cause the game to not run at all.
The NVIDIA GeForce FX series is unsupported under Vista.
I got this info from the Sims 3 website. So, buryuntime, you might have some trouble with the game as well.