My guess would be that...it's the relationship of Media Player to Windows. It's an integral part, so a hiccup that would normally just crash the application...might result in Windows rebooting.
It could be your display drivers that are crashing, I suppose.
I play around with editing graphics files...never had anything shut Windows down, normally the result of bad data will freeze the app that I'm using to edit.
You could try running it in WMM...if there's an unreadable part, it should freeze WMM.
You could also take a look in Event Viewer and see the detail that is captured there when the reboot occurs.
It could also indicate hard drive/partition fragmentation, I suppose. Fragmented data should cause a hiccup of some type, but not a system shutdwon.
Edited by hamluis, 17 September 2011 - 05:48 PM.