Me again ... this one states a Driver_IRQL error again .... nv4disp.dll (an nvidia file) is the culprit whilst running Windows Media Player. Your graphics card drivers are up to date yes? Which version of WMP are you using? Try using VLC Media Player .... http://vlc-media-player.en.softonic.com/ .... No other codecs needed - plays almost any file! .... Dunno if that will sort out your problems but it's worth a try. Let us know how it goes
EDIT: I was thinking ... looking back on the RAM issues that you had .... how much virtual memory do you have assigned? How much RAM do you have installed on the machine? Right click My Computer > Properties > Advanced Tab > Performance Settings button > Advanced Tab > Virtual Memory .... You can try increasing the size of your page file - do this gradually and see if the BSODs disappear.