Windows Media player 11 freezing on screensaver resume

We currently use power DVD and windows media player used for playing audio and video, power dvd has no problems when playing back a DVD so my current solution is ask staff to use that. Staff accounts are set to lock after 10mins of idle, during the playback of a DVD on windows media player the screensaver kicks in after 10mins then the user is prompted for their password to resume, when they enter their password to resume playback media player completely locks up on them. Has anyone here experienced this problem?

Oh just to add we have K-lite codec pack installed on them

Sounds like a codec issue, check you do not have more than one "all rounder" codec installed and then you remove codecs and re-sintall up to date versions - also a change the screensaver to a different one might help?

Having removed oggcodecs and k-lite pack I still have the same issue, also tried installing the windows codec pack I'm still having the same problem