For software DVD playback, right off of WinDVD site:
What software and hardware must be installed on my computer before I can run WinDVD?
Intel CPU with 350 MHz and MMX, or AMD CPU with 450 MHz and 3Dnow! (See the CPU requirements below for more details.)
Second Generation or newer DVD-ROM drive
AGP graphics card (PCI may perform up to 30% slower) with hardware overlay support (See the Graphic Chipsets FAQs for more details.)
32 MB system memory
20 MB available hard drive space
Microsoft DirectX 7 or higher enabled graphics subsystem
Microsoft DirectX Media 6 or greater
Audio subsystem that supports up to 48Khz stereo playback (PCI desirable).
Sorry...
Here is the website:
http://www.intervideo.com/jsp/Support.jsp