Hang Up when MPC & Potplayer
 

I install Dispplaylink driver 5.3, I use extend mode for my 7" Mino LCD , 800 x480 . When I use potplayer or MPC or Kmplayer to play video on my 42" LCDTV, the palyer will hold or hang it . , I need to restart the PC. What happen ?, when I use under XP , it is no problem.
My Config
OS Win7 Ultra.
Display card : ATI 5450
Displaylink device : Mino 7" mon.