Cannot install windows 8 because the disk is in MBR partition. Need help.

I am on a MacBook Pro 13" Early 2011. I am trying to install Windows 8(OEM) using bootcamp witht a USB. I made the USB bootable from the Windows Usb tool, and made the Bootcamp partition through bootcamp. I hold down the option key at startup and select the usb. It starts the setup, everything is fine untill I select advance option to install and select the BOOTCAMP partition. It says you need a GUID partition table to install but I have MBR. I have checked in disk utility and the partition map scheme is GUID partition table. Do i have to format the whole drive to fix this? That really isn't a problem. Also, FYI, this mac recently had its logic board replaced by apple. Could that have anything to do with it?
I have been stuck on the problem for days and it is getting really frustrating. Any help is appriciated. Thank you.

Hey there, I have the same problem as Noor440 discribed, just that I burned a dvd with Windows 8 and it doesnt work. I can boot it from the CD in EFI mode but then it happens the same as with Noor. I can't install it because of MBR and its asking for GPT.
The thing is that when I try to boot from the regular CD (not in EFI mode). My screen goes black and I can't do anything about it.
I read in different posts that to install WIN7 or XP I have to have my optical drive at the original place just that I removed it in order to install an additinal SSD.
Is there no other way than to open my macbook again put the SSD in the place of the original HD (at the moment it is in the slot of the optical drive) and then partition my SSD with bootcamp, install Win 8 and change the optical drive with the HD again. Last but not least I would need to redo the syslinks as well ...
would be nice if anybody has some good suggestions wether I can avoid that all ...
thanks a lot

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