GTX 660 64-bit not working?

I had my windows 7 on 32 bit at first and it worked perfect, I decided to upgrade to 64bit because I didn't like the memory restriction and wanted to use my 8 gigs of ram. The problem though is now if I install a 64 but driver for the card it won't display anything, it will just be a black screen, you can hear everything going on in the background but can't see anything?

Adrian2013-07-11T18:59:41Z

Remove existing drivers first (32 bit). Reset back to default Windows VGA, boot to 64 OS, and only then install the new 64 bit drivers.