windows 7 64 Bit.. most games lag..HELP!!

I used to have a 32bit windows 7 but i recently got my RAM upgraded to 4GBs and hence switched to a 64bit version to get full use of the memory...but in the 32bit version games like crysis,crysis warhead and just cause 2 ran without any problem ( i have a core 2 Quad 8400 @2.66 GHz 4 GB ram and GeForce 9500 GT) but when i insalled the games to play again they lag like hell...i mean even the loading screen changes frames "reallllllyyyyyyy sssllloooowwwww ". I know the card isn't the best but i play the games at medium graphic settings and my monitor is old so the resolution is also a maximum of 1024x768..so i dont need "RAMBO" to destroy the games

anyone got any solutions?????

P.S. i recently played crysis 2 with 'gamer' settings and it ran flawless...!!!

Well then I guess you should go back to 32 bit because maybe 32 bit programs don't work that nicely on 64 bit as they should.

gameranand said:
Well then I guess you should go back to 32 bit because maybe 32 bit programs don't work that nicely on 64 bit as they should.

Well i could have but i wont be able to use the 4gb memory..that's the last option...

Lets see if anyone has another solution!!!

Just re-install your drivers again. They should be the 64BIT version for your adapter.