Windows Media Player will not run

I use a program called "Your Uninstaller!" which lets you uninstall programs that do no appear in the add/remove programs list. It also scans the entire disk for unused registry entries and files and completely removes all traces of the program. Their website should have a trail version so I'd suggest trying that.

If all else fails use Windows Media Classic. It's great.

I've gotten everything to work by default in VLC, with the exception of one movie and commodore SID files.

I'm expecting that if WMP and Winamp don't work that other media players are going to behave similarly. Also, note that this is only an issue with a single user account on the machine; if someone knew what registry entries or whatever to copy from one use to the other...