Win7 install help

I am getting this messege when I try installing Win7 to my Vertex 3 120GB. This drive was just being used in another pc so I know its good.

"The selected disk has an MBR partition table. On EFi systems, Windows can only be installed to GPT disk"

 

First, how did this happen?

How do I fix this?

Thanks for any help

why not format it to a GPT disk?

How do I do that? ive never had to do that

during the install select advance setup or something and reformat the drive

 

http://windows.microsoft.com/en-us/windows/installing-reinstalling-windows#1TC=windows-7

I reformatted and the same thing

http://technet.microsoft.com/en-us/library/dn336946.aspx

 

good luck

Thanks!!!! Im rolling now, and I learned something :)