Windows Media Center

I have another post regarding this issue but feel it will not be looked at so I am re-posting it since I have narrowed down the issue. When I am playing Guild Wars online (slightly similar to WoW) and I log off, Windows Media Center opens by itself. This is the only time it does it. I have every aspect of WMC disabled for start-up etc. but it keeps opening every time I close this game. I am at my wit's end trying to determine why it is doing this. I have went through my anti-virus and firewall settings to make sure they are not attached somehow and I have checked within Guild Wars to see if it is attached there somehow but it is not. Guild Wars does not use WMC since WMC is not open or running when I minimize the game. Any ideas?