Snow Leopard won't install because drive is not Mac OS Extended (Journaled)

I cannot install Snow Leopard (from regular Leopard) on my other 21" Intel iMac (not this one) because the hard drive is apparently only Mac OS Extended and NOT Mac OS Extended "(Journaled)".
Is there a fix for this? Everything else on the computer is working fine (and has been for a few years)
I'm not sure how it got that way but a few years ago I used Disk Warrior to correct some problems - maybe I re-imaged the hard rive using Disk Warrior into the wrong format?
Disk Utility confirms that the hard rive is indeed Mac OS Extended (what is the difference with "Journaled" anyway?).
I'm loathe to erase the disk, reformat, and use Time Machine to reload the data (what if the back-up drive is incompatible with the reformatted Mac OS Extended Journaled)? Maybe I can use Disk Warrior to re-image the disk to Mac OS Extended (Journaled)?
Please advise best way to handle this situation.
Thanks!

If you are certain the only problem is that the startup volume is not Mac OS Extended "(Journaled)" you may be able to fix this with Disk Utility: Select the volume in the list, then press command + j or select "Enable Journaling" from Disk Utility's File menu.
However, the reason the Snow Leopard installer may not allow the install is because the drive must be formatted with the *GUID Partition Table* Partition Map Scheme. If you, you will have to reformat the drive. To determine the Partition Map Scheme, select the drive (not the volume name indented below it) in Disk Utility & look at the last line of info in the window.

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