problems with tv screen after using bsplayer
 

I am using en NVDIA graphic card + a Super VHS-cable connected to my tv, to watch DIVX movies on BSplayer - on my TV screen.
When I switch from PC screen to TV screen and I open BS player, I get a window and I can load the movie + subs (srt file).
No problems so far.
When I double click on the BSplayer window to get full screen, everything goes as planned.
But when I double click again to get the original size of BSplayer window back, my TV screen has enlarged so much, I can't even see the toolbar at the bottom of my screen.
When I eventually succeed in getting the vieuw back on my PC screen (very difficult when you don't see a toolbar !) everything is normal on the PC. The problem with the 'big' screen appears only on the TV.
Can anyone help me with this problem please....??? TNX !!