Give this a try I found it on Pdaphome.com in the FAQ.
Dead Media Player
Use a registry editor, goto \HKLM\SOFTWARE\Microsoft\Shell\Keys. This is
where you have hardware button mapping. You should only have 2 keys there
(Mine is named 40C1 and 40C2).
If you have the window media issue, you should find another key there, which
was put by some other softwares installation, for e.g. Fonix voice central.
You need to delete it.
OR, this may also work....
Using File Explorer look in the Windows directory and find welcome.exe, run
it and go through all the stages - thats it.
> I have a Pocket PC 2002 Phone Edition with the Windows Media Player 8 for
> Pocket. When I run Windows Media Player doesn't work anymore! I tried to
> delete the folder and re-install a few times but nothing! When I run WMP
> appears in the top left of the Pocket the title Windows Media Player, like
> when you run the problem, but suddenly desapear and nothing! Someone have
> soluttion for this problem?