Right, I successfully installed Win 7 Ultimate last night. Even managed to do it on my first attempt this time!
These are the steps I took.
1) I shut down computer and removed my OSX system drive. (I have 2 Samsung SSD's, one for OSX the other for Windows. They 'look' very similar in the Bios and Windows install screen so thought it best to remove it rather than risk accidentally wiping/overwriting my working OSX install)
2) Start up machine and go to the Bios.
Save a profile of the current working config. (ie. OSX is working nicely so I wanted to restore these Bios settings later).
3) From the same Bios screen you just saved a profile from now choose the
Load Optimized Defaults option to reset your Bios back to factory defaults.
4) In the
Bios Features tab, check that
Boot Option #1 is set to your intended Windows installation drive. (With my OSX drive removed I have a total of 2 drives available, my SSD and 2x HDD's used for documents and storage).
5) In addition to the above scroll down to
Hard Drive BBS Properties (still in the Bios Features tab) and select it to open another drive priority menu. Again set #1 to your target Windows drive.
note. For steps 4 and 5 when choosing my drive I noticed the drive name/ID was prefixed with a P rather than UEFI.
6) Save and Exit Bios. Hold down F12 to enter the boot menu after the computer has restarted.
7) Choose your Windows Installer disk and boot into the installer (my installer is on a USB drive, I don't have an optical drive in my hackintosh).
8) Click through the installer options and choose Custom to do a clean install. Formatting your target drive from the installer tool.
9) If all has gone well you should now be able to install succesfully. Hopefully you won't be getting the non-bootable drive error. As I didn't get any issue this time around I'm hoping that restoring the bios to optimised defaults was what made the difference, along with setting the correct drive order.
10) If all goes well you should now have Windows installed. At this point, if you were to restart you computer it would automatically boot back into Windows every time. That's a good thing as by the time you've installed all your Windows drivers, system updates etc you'll have restarted the computer several times! Once you're happy with your Windows installation shut the computer down again.
11) Reconnect your OSX drive.
12) Start-up the computer and enter Bios, restore the profile you saved at step 2. Check your boot priorities again and make sure your OSX drive is now #1
13) Save and exit - Hopefully you should now get the Chimera* boot-loader with a new NTFS disk that you can boot into Windows from. (Depending on how your Chimera boot sequence configured you may need to press a key during the countdown timer to display your available boot drives. I have mine set to go straight to the boot selection screen rather than display the timer bar thingy - timer countdown is what is shown by default).
*I assume you used Unibeast and Multibeast to install OSX.
Hope it works for you, good luck!