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Me too!!

I'm having the same problem, after having a boot problem and reinstalling 10.5.5.

My Mac thinks I'm no longer the Administrator, and clearly I am (I'm the only user, and the Accounts panel clearly shows I'm the Admin).
 
First, can you re-upload the picture? (preferably using MediaFire)

Second, check file permissions for the hard drive. You can change them in Finder- right-click the item, get info, then in the Sharing and Permissions section at the bottom. You may have to click on the lock at the bottom-right corner to change permissions.

If that doesn't work, check the formatting of the drive. Remember that Mac OS X cannot write to an NTFS drive. (OS X is compatible with HFS+ or Mac OS Extended, FAT, and can read NTFS )
 
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