Windows can't be installed on a GPT HDD

The problem started today. I bought the Western Digital Red edition 3TB SATA 6gb/s, and then I went to install my Windows on it. It seemed fine, worked fine, but when I went to My Computer, it said 1.98TB free of 1,99TB, while my HDD is 3TB.

Tried many things such as re-formatting my HDD and converting it to GPT (success), re-creating my USB Flash Drive with Windows for UEFI PCs, and this

The actual problem is that, when I convert my HDD to GPT, I can't install windows on it. It says "Windows can't be installed on Drive 0 partition #", and I can't click next. If I click "delete" it will partition my HDD in 2 - one of 2TB and other with the remaining GBs.

And, is there a way to put my HDD as UEFI in my BIOS? Because I didn't find a way to do so.

EDIT: also tried Rufus to put my Flash Drive as GPT and didn't work neither (it isn't booting).

Are you booting the DVD/USB in UEFI mode?

Yes I did that but it didn't work.

Try partitioning first.

To clean install:
1) Clean the HD Drive, using Step one in this tutorial:
SSD / HDD : Optimize for Windows Reinstallation
Diskpart
Select disk 0
Clean
Convert gpt
Create partition efi size=200
Assign letter=s
Format quick fs=FAT32
Create partition msr size=128
Create partition primary
Assign letter=c
Format quick fs=NTFS
Exit




2)UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with

Also tried it, didn't work neither. But I think it's a problem with my Windows .ISO - I have the ALL IN ONE one.

You may like to get a DVD & license key from a good source like:
Windows Download and Shop - Microsoft Windows
That way you will have a DVDx64 with uEFI support.

Where do you buy your DVD from?

I didn't buy from anywhere - I downloaded it. But after downloading a new version of it solved the problem.