Installing Windows 7 64bit?

When you try to boot 64-=bit Windows 7, or Vista SP1 and later, it requires an EFI firmware that is also 64-bit which the iMac lacks. The 'fix' is to modify the ISO and reburn it.



Solution (need a working windows installation or a windows-pc):

0 - create 3 folders c:\windows64iso c:\windows64exe c:\windows64dvd
1 - download this ( http://sergiomcfly.googlepages.com/oscdimg.exe) .exe file and put into c:\windows64exe
2 - put .iso you downloaded from ms (or an .iso you created from your retail windows disc) into c:\windows64iso and unzip it
3 - move .iso file out of c:\windows64iso and trash / delete it (won't need it anymore)
4 - open a dos prompt in c:\windows64exe and type:

oscdimg -n -m -bc:\windows64iso\boot\etfsboot.com c:\windows64iso c:\windows64dvd\windows64dvd.iso

The windows64dvd.iso is the file you gonna burn onto a new DVD
http://forums.macrumors.com/showthread.php?t=716198

I had to do somewhat similar approach to burn a DVD I could boot from and use to install.
http://jowie.com/blog/post/2008/02/24/Select-CD-ROM-Boot-Type-prompt-while-tryin g-to-boot-from-Vista-x64-DVD-burnt-from-iso-file.aspx

I think you can use 32-bit and doesn't have the Select CD Option: 1 or 2

Hi - First post here as well. I'm new to the Mac world, please bear with me. I've been looking for an answer to my W7 RC 7100 64bit bootcamp install issues - hope this is the right topic. Here's what's happening:

I seem to have installed W7 properly on the Mac Pro - got all the way to installing the BC drivers from the Mac DVD. I've made OS X my default OS (Mac preferences), however, when I reboot with the "option" key held down, I'm not given a choice of which OS I'd like to boot to. Note, I can see the Bootcamp drive mounted on the Mac desktop, but I can't seem to get back to my W7 install. Hopefully this is just a beginner's issue - any insight would be appreciated.

Try the Startup Disk control panel in OS X.

Even try by pulling OS X (hopefully you didn't put both on the same hard drive.

Try booting from the Windows DVD you made and see if you get there, and then use System Repair. Hopefully one of those will get you one step forward.

Even boot from Leopad DVD and go to Utility menu => Startup Disk

Thanks for your quick reply.

My Startup Disk shows a Mac OS X on Mac HD icon and a Network Startup icon - no Bootcamp. But, my desktop shows a Bootcamp mounted drive - not sure what this means. Shouldn't I see an icon for the Bootcamp drive?

I noticed in one of your other posts you talked about shutting down the box, removing the OS X hard drive and rebooting - this should take me into W7. Then what - look for updated drivers for BC? Use System Repair to repair what? Is the OS X partition messed up? Did W7 trample on my Mac hard drive? I'm not even sure what's wrong...

Is there a problem with BC 2.0 not supporting the 64 bit W7 RC (7100) OS? It appears some folks have got it working (however, many posts fail to mention if they've installed the 64 bit or 32 bit version).

My hard drive set up goes like this - OS X is on the main drive (the 640Gb drive that came with the box) and I'm trying to install W7 on a 1Tb drive. I've also got a second 1Tb drive that I will use for archiving (once I get this dual boot thing going). So, as you can see, nothing fancy.

I used BC Assistant to partition the 1Tb drive that I've set aside for W7 - I used FAT32 with the understanding that when I installing W7 I'd reformat with NTFS - seems to have worked, but not sure if this is the correct way to do it.

As you can see, I'm pretty close to getting it going, but getting a little frustrated - BC seems a little flakey - but then again, I'm trying a new 64bit OS, so I shouldn't be too quick to blame 🙂

I found/installed BC 2.1 (64 bit version for Vista x64) and it seems to have solved the issue. My bad for assuming my 10.5.6 install disk had the proper drivers for BC.

Your suggestion worked flawlessly. I was able to get past that screen. Although I had to use cdimage.exe instead of oscdimg. Thanks so much for your help.