I Can't Watch Movies While Playing Fullscreen Games

So I used to be able to play a video or steam something from the internet while playing a fullscreen game like warcraft 3 or some first person shooter. My problem is that now when I play a movie then try to launch a game the video player goes black when either in fullscreen or just windowed, this also applies to iTunes. I have the latest drivers for my GTX 460 and I have tried using windows media player and vlc media player. All answers appreciated.

what is your system...Win 7 ????...try as..... alt+enter to full screen..Or try to run old games in compatibility mode...(right clik on mouse)... maybe can be the drivers in the old games..You very lucky to play still warcraft 3 ...Also try to play a new games (directx 11) to your new grafic card ..... play the old pc games to have the old grafic card and the old pc system.Another try to the emulators to full screen mode}

the only thing that i changed since i built my computer 4 years ago was i added more ram to get 4gb to use win 7 64bit and a new video card upgrading from a 8800 gts to a gtx 460. ive updated my video drivers to the latest and everything else is most likely auto update.

viewsonic q20wb

http://www.viewsonic.com/products/archive/q20wb.htm

your screen resolution is 1680x1050....and the games usually using this resolution… it tryed in who low analyses that the games are support….and you look always at him from options the game....suppose in other resolution you play full screen? Finally change monitor and no nothing other......all ok

to watch video try to donload another video player kantaris ......http://kantaris.org/downloads/ player ......and go to the properties and tryed to manual resolution to your monitor support 1680x1050