Hi. can anyone guide me how to use reshade framework or even sweetFX with gears of war? every time I try to use it, it gives an error "d3d9.dll:you cannot run the game with modified executable code. Please reinstall the game. whenever I delete it, it works perfectly tried everything but nothing works. want to play the game but it needs some tweaks :D

That sounds like it has a protection against things like reshade. You will have to find a workaround launcher or something to bypass the protection. Someone on the Reshade Forums had used reshade with Gears Of War so maybe the reshade forums can help you (and possibly that individual will post letting you know how to get it working).