I purchased mountain lion, but after numerous attempts until my fingers all gone numb, i simply cannot install it on my imac. i get this error message: "an error occurred while installing OS X, you cannot install OS X on this disk......". please help.

I purchased mountain lion, but after numerous attempts until my fingers all gone numb, i simply cannot install it on my imac. i get this error message: "an error occurred while installing OS X, you cannot install OS X on this disk......".
please help!
imac specs:
IMAC 24 inch Mid 2007
Intel 2.4 GHz 2 duo
4GB SDRAM
OS X lion 10.7.4
200 GB Harddrive space free

Tell us more about the disk and partition onto which you are trying to install Mountain Lion:
Open Disk Utility (in Applications > Utilities). The left column should show your disk with its partition(s) indented below it:
How is the disk (top level container) formatted according to Disk Utility:
* What Partiton Map Scheme? (Should be "GUID Partition Table".)
* How many partitions? (Should be 1 unless you have a Boot Camp partition.)
How is the partition (lower level container) formatted according to Disk Utility? (Should be "Mac OS Extended (Journaled)".)
Message was edited by: markwmsn
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