Default WMP issue and screen going blank

couple of issues with P3450:
1. my windows media player has suddenly stopped working. cant start it. Also, my audio manager doesnt seem to detect any songs although m able to play the songs in core player. And my ringtones too are not working and can only use default ones. i guess its bcoz of WMP not working.

2.My HTC Touch lights up suddenly after every 5 mins and d screen goes blank for a sec. Is this a virus or something?

Kindly help........