How to convert one partition from mbr to gpt

I had formatted my laptop(ACer aspire 4750g) and is trying to install windows 7 professional, but there's a message that says "windows cannot be installed to this disk. The selected disk has an MBR partition table....Windows can only be installed to GPT disks.".
I have one partition for my backup and the other partition is unallocated. How can I change the unallocated partition to GPT without changing or deleting the other partition?
Thanks in advance..
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  1. Hi
    And what type of partition is the other one that holds you Backup ?
    How many GB do you have there ?
    Can you move you data out of this HDD - USB , USB HDD .....

    Changing partition type having data is time consuming process and i suspect the second partition is also GPT formated so this bring the setup warning massage ....

    I advise you to take out you data and compleatly erase you all HDD then the setup will not bring any anoing massages .....
    After you`r done bring back all data in the second partition - you can create this ine under WIndows
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