When I change to TaskManager and close MediaPlayer, I get the 'Error Reporting Message' and send it off, but then nothing back from Microsoft.
They never do. I don't think those reports go anywhere useful.
If you go to Control Panel - Administrative Tools - Event Viewer - System you may see an error message telling you what went wrong. It may or may not be helpful, but checking that error message via Google or via here might reveal more about the problem.
When you redownloaded it, did you remove the old copy first, and restart the machine? That might (I stress might, not will) sort it.