Various issues with installing Windows 7 installation.

I wanted to do a reinstall of Windows 7 and so far it's done nothing for me except cause stress and frustration. First it tells me it cannot install to disc because it's GPT, whatever that means... So I'm told to do Shift+F10 and enter these commands:

diskpart
select disk 0
clean
convert GPT

This appeared to work but then I got a different message. It reads "Windows cannot be installed to the disk. This computer's hardware may not support booting to disk. Ensure that the disk's controller is enabled in the computer's BIOS menu."

Not sure what to do from here... It managed to install Ubuntu so the HDD itself is fine. It's just Windows 7.
I'm on an Acer Aspire V531 BTW.

Please help this is my only computer....

It also appears that the Next button enables now, even though I still get the message. When clicking next it copies the files and then gets stuck on expanding at 0%.