So I purchased a new Thinkpad and had it pre-loaded with Windows 8. Now I regret that decision for many reasons and would like to install Windows 7 while keeping Windows 8 intact. The partition Windows 8 is sitting was quite large so I shrunk the volume via 'Disk Management' and allocated more than enough to run both operating systems in their own partition. Everything looked good from there and I was ready to proceed with the install of Windows 7 with the use of my DVD until it got to the section where setup asks which partition to install to. Choosing the empty NTFS partition setup gives me the following message and I can't proceed, "Windows cannot be installed to this disk. The selected disk is of the GPT partition style." Is there any easy way around this? I'm guessing this is because Windows 8 was installed via UEFI and GPT...
Try to boot installation DVD the EFI way - see options in firmware.
You boot installation media the EFI way - GPT disk is expected as target
you boot installation media BIOS/legacy way - MBR disk is expected as target.
a) Dual-boot setup for BIOS way is widely known and there are plenty of tutorials.
b) EFI dual-boot is new teritory - you cannot find many tutorials on the subject.
If you think you are technically advanced go for EFI/GPT - you have W8 already installed.
After you install Windows 7 you will have to repair boot environment / reinstall W8 boot environment / and hopefully after that you will have a dual-boot menu.
Reinstalling boot environment is usually done with "bcdboot.exe" command - for EFI maybe one additional command is needed. Will post a link later on subject or just post the commands needed.