Sansa Express 1Gb not using MTP

A few years ago my Sansa Express 1GB was working as an MTP compatible device.  Then, last year, my PC died and I replaced it.  Then, this year I needed to re-install my Windows XP Pro SP3 and now my Sansa Express 1GB appears as a USB drive instead.

Can I get the Sansa set back to a MTP device?

I found the solution to my problem!  To get any MP3 player to work as a Windows XP MTP device, you MUST install Windows Media Player 10 before updating to Windows Media Player 11.  If you do not, MTP protocol will not be installed and the MTP protocol is not available as a separate download.