Macbook Pro 17-Cannot install Snow Lep. How to solve the error message GUID

When I try to install Snow L., I get the error that my disk did not use the GUID partition table scheme. The install prog says to use the disk utility to change the partition scheme. It further says to select the disk and then the partition tab, and then the volume scheme and then use the option button to change it. Problem is that when I get that far, the option tab is greyed out. There is only one partition. This laptop was factory new January of this year. How do we do this without erasing everything and starting over?
PLEASE email <Edited by Host> if you can tell me (PLEASE) what to do. Lastly, I DO have a TM backup and Fusion is running XP Pro.

Regardless of your current dilemma you need to have a least one complete backup in some form. Disk drives fail - not if, only when.
You should get an external drive with enough capacity to contain a complete backup.
You can make a bootable clone using either:
SuperDuper! which I use. You can find it [here|http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html]
or Carbon Copy Cloner which many people also highly recommend which can be found [here|http://www.bombich.com/software/ccc.html].
SuperDuper! has a free version that will make a bootable clone, and Carbon Copy Cloner is donation ware.
Time Machine is also a good option.
I would start with a bootable clone. All it will cost you is the drive.
With a bootable clone you can boot it and verify that you have a working clone of your system before messing around with the MacBook Pro's internal drive..
I backup everything twice via 2 different methods: Time Machine to a Time Capsule and SuperDuper! to an external drive.
I learned the hard way that all disk drives are subject to failure even backup drives. I was very lucky, the backup device failed immediately after I had restored my wife's data to a new laptop after the laptop's drive failed.
I went to make a new backup of the new laptop and the drive was dead.
Disks are cheap and getting cheaper. If you value your data you need to have backups.
Steve

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