Display adapter disappeared

Hey, I have been looking around and cant find a solution to this problem.

Just this morning I turned my laptop on and realised the resolution was at its lowest and when I went into the device manager of my computer the display adapter had gone realising the computer had no graphics driver. I went on to the Nvidia website and downloaded the latest driver for my graphics card the Nvidia Geforce 8600M GT, and as I was installing it, an error came up saying 'the nvidia setup program could not locate any drivers that are compatible with your current hardware'.

I think its using my integrated graphics cards but I don't no how to get the other one to work again.

Hope someone can help, thanks.

Yea sorry I should have been more specific.

I have windows 7 ultimate 32 bit
Dell Alienware M15x

I'm not to sure what the integrated graphics card is but the one which is being used now which was automatically installed after I restarted my laptop which is the Mobile Intel(R) 965 express Chipset Family and it was orginally the Geforce 8600M GT.

Im not sure if there are service tags on alienware products but, I would go to dells website and type in your service tag and it should list all video drivers for your machine. I would also consider calling dell to point you in the right direction for the correct driver. They can also troubleshoot the machine to see if there is hardware failure (it maybe possible your video card went out and switched to integrated graphics). Just some things i would try.

I tried installing the video drivers which the dell website gives you but it still says the same thing as before with the nvidia driver.