http://www.microsoft.com/windows/wi...ase.aspx#sysreq

Optimum Configuration
(to play 1080p video with 5.1 surround sound)

Windows XP
Windows Media Player 10
DirectX 9.0
3.0 GHz processor or equivalent
512 MB of RAM
128 MB video card
1920 x 1440 screen resolution
24-bit 96 kHz multichannel sound card
5.1 surround sound speaker system