M17x discrete graphics issue

After a recent format (the first) of my alienware m17x, i installed vista and all of the drivers on the support cd. Everything is working fine, except it will not recognize the discrete graphics cards, and only displays the standard vga graphics adaptors in device manager.
On an alienware support thread it claimed fn-f7 would (the ac power is always plugged in btw) switch between the integrated and discrete graphics cards. Yet fn-f7 does nothing at all. After checking bios (as per some fourms) i have no access to advanced graphics settings, and the options are super limited in general. Any help would be much appreciated. Also, apologies, my knowledge of computers isn't extensive.
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More about m17x discrete graphics issue
  1. Hello and welcome to the forums :)
    The discrete card is 9400MGT,so go to Nvidia's site and download the latest drivers for it
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