I'm having troubles installing 10.6.3 on my Macbook Pro, PLEASE HELP

I'm getting the error that seems to happen to a lot of people: "(volume name)" can't be used because it doesn't use the GUID Partition Table scheme.
When I go to change the Volume Scheme in Disk Utility it's grayed out and says Current, and the Options button is also grayed out, so I can't touch either.
So I try to boot the machine using the Snow Leopard 10.6.3 disc by holding the "c" key during start-up (bong sound) and it spits the disc out and boots normally... is the SL disc not a boot disc as well? I don't care if i have to format the hard drive, I just want it to work with the newer operating system(s). I'm just worried I'll format my hard drive, go to boot with the disc, and it'll pop it out again.
Please help. I'm losing hours at work trying to get this thing updated to Mavericks via Snow Leopard

Do a backup before proceeding.
Try putting the 10.6.3 disk in the computer. During a restart, hold down the option/alt key, select the disk, and see if you can boot from there. If so, select the language, then go to the Utilities menu, and select Disk Utility. Check to see what partition scheme you have by selecting the hard drive.
If you don't have GUID, you are going to need to erase the drive and reformat, which will cause you to lose all your data. Did I mention doing a backup?
If you do have GUID, run Disk Utility repair disk and repair permissions. You may have to do this more than once. Then try in install 10.6.3.
If successful, use the combo update to get to 10.6.8 and then run Software update until there are no more updates.
10.6.8 Combo Updater

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