Yes, you can upgrade just about any Microsoft product. Again, goto
Microsoft.com and have a look.
Also, check out http://www.download.com
do a search for what you want and see how that turns out.
codecs are the lesser known, software that keeps changing.
Windows 2000 is an upgraded version of NT so I know that there is a patch or upgrade to make your software play the video. I know this is aggrevating. I just recently went throught a fight to get a codec for div4.
Takes a bit of looking to get some things. Don't for get about "Quick time".
You'll need this someday. Its Apple's version of WMP. Good luck