In D|S, Help>About your video card should give you some information. Or right-click on the desktop, select properties, and the monitor and video card wil be listed on the settings tab (tyou can click the Advanced button to get more information on the Adaptor tab).

A decent (but not necessarily super-powered) video card, plenty of RAM (up to 3GB if you will use Windows 32bit), and a Core 2 Duo or Quad chip would be the obvious things to get, plus one or two large hard discs, DVD burner (or something with highercapacity) and a good quality display that you can calibrate.