Anyway to convert MBR to GPT on main drive?

I saw that Disk Director v11 can convert from MBR to GPT on drives. I was looking to start using UEFI on my Lenovo T420 laptop. But to use UEFI I need to have a GPT based Hard Drive to boot from. But looking around there is no simple way without data loss. So I ran across the Acronis information and knowledge base articles that said it can be done so I got it.

Now when I launch it I cannot convert the main drive (which in my case is my 120gb SSD) to GPT. It only gives me the option of Convert to Dynamic. My 2nd HDD (in the ultrabay) which is a 500GB has the option of Convert to GPT.

How come the 2nd drive can support it but the main drive with my Windows7 implementation wont?

I even tried to create a boot media and boot from the USB I made thinking maybe it cant be done inside Windows, so launched off the boot media and same thing, still cant convert to gpt on the SSD.

Or is it just that it cannot be done on the main drive or the fact that it knows it an SSD?

Dixit