about to upgrade from CD-ROM to DVD-ROM Drive, any advice?

I am planning to upgrade my CD-ROM drive into a DVD-ROM drive for my
computer. I have a computer with these specifications:

- Intel Pentium 4 at 1.4GHz
- 256 MB RDRAM
- 30GB Hard Drive
- 52X CD-ROM
- 48x write/12x re-write/50x read CD writer
- Nvidia RIVA TNT2 Model 64 Video Card at 32MB
- Windows XP Professional

The reason that I'm doing this because, I want to watch DVD movies on my
computer. Does anyone know which DVD-ROM drive they suggest? If in most
cases, most DVD-ROM drives include software. If it doesn't, which software
program do you suggest? I need to get a DVD player program, that is free and
stable. Also, how about the video card that I have on my computer system? Do
I need to
upgrade it as well? If so, which video card do you suggest for my system. My
system can handle AGP 1x, 2x and 4x cards only.


If you have any questions, comments and/or suggestions, please do not
hesistate to do so. Thank you.

Yours Truly,
Simon