Windows 7 x64 on 2011 iMac

When I start up boot camp and put my Windows 7 with service pack 1 x64 Ultimate edition DVD in, boot camp doesn't recoginze the disc. I can put in my Windows 7 Service Pack 1 x86 Home edition and everything works fine. Can anybody help me out? My machine is up to date, I downloaded the "help drivers" to a USB. Any help would be greatly appreciated.
Thanks

The hatter wrote:
The iMac even with Penryn processors which are definitely 64-bit still was not supported by Vista 64-bit in 2008 even as a lowly MacBook Pro was support list, and MacBook also (briefly, the Late 2008s of MB were taken off the list for x64).
Vista went 64-bit kernel in 2005 but UEFI was not adopted until later, and UEFI support part of 64-bit ROM with SP1 and later. So early 64-bit Vista was fine but had trouble booting DVD later we all found out.
I never understood why the iMac didn't get 'blessed' and get UEFI by then, and whatever logic or reason... part of Mad Hatter's rabbit hole where down is up and left is right.
More Tea Hatter?

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