M15x On Gtx660M Help

[Walt0929]

Hey there. I own an Alienware M15x. 8 gb Ram, 150 watts adapter, core i7 720, ssd and the gtx260m. I just got the 660m 2gb from China, a Dell one. I am completely stucked in here. I've read a lot of forums regarding the installation and the mod.inf infos. I haven't been able. When i first put it it completely turned off my laptop several times then i disassemble it and then it worked. Id doesn't recognize the card and when i try to install de drivers it always givesme an error. Can you help me please?

[Khenglish]

What is the error? Is it that there is no recognized hardware? If so you need to do an .inf mod and it will work.