Give youself permissions then :P
I am unsure of how to uninstall OS without formatting though, so unless you make a partition on G and move that partition as a backup to your main hard drive, I do not know, for the partitions I use mini-tool partition wizard home edition, it works very well with Windows 7 all versions.
For permission just right click on the drive/properties/security and set permissions accordingly, you may be able to turn off UAC at least till you get it sorted out, this may help as well.
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