Widraz
Can you show us (screenshot) what you see in Gparted in the pc's current state? A screenshot would show the exact state of your disk, which can help debugging your issue more reliably than messaging back and forth.
It's even possible that, since you didn't specify it in your steps, it could be that you simply forgot to apply the changes in Gparted (this happened to me once as well, since Gparted already shows it as 'Unallocated' before you apply the changes).