Dual PC monitors/screens

hi, i got a new 42 inch t.v and hooked it up to my pc. i use the small one for browsing and want to use the 42 for gaming. when i try to start gta4 i sign into RGSC then the game starts to load and just as the game should pop up both screens flicker then i get an error, this is probably due to the trainer i use. i can start need for speed world with no problems but it only plays on my smaller screen, could anyone give me an easy to use guide on how to fix my problem ?
 
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