Fallout: New Vegas System Requirements:
OS: Windows 7 / Vista / XP
Processor: Dual Core 2.0 GHz
Video Card: NVIDIA GeForce 6 series, ATI 1300XT series minimum
RAM Memory: 2 GB
Hard Drive Space: 10 GB
Basically, Bethesda said in their latest podcast that if you were able to run Fallout 3 on your machine, you should have no trouble running Fallout: New Vegas. Hopefully without the problems and crashes of the previous game!