OS X 10.5.6 Time machine can't open "Macintosh HD"

I recently set up Time machine to backup to an external Firewire drive. According to the status in the menu bar it has been backing up fine. When I enter Time machine and try to browse to my internal hard drive which is labeled "Macintosh HD"
I get the following error:
There is no default application specified to open the document Macintosh HD.
Although I do not seem to be able to take a screenshot within Time Machine, the same error occurs if I try and browse the backup directly in the Finder window. See here: http://www2.itec.suny.edu/~lofftjm/timemachineerror.png

Okay, the only thing I can think of is this.
1. Turn TM off (in >System Preferences...>Time Machine. You may have to unlock the lock to disable it.)
2. Go to >System Preferences...>Sharing, and unlock the lock if necessary.
3. Under "Computer Name", click "Edit", and change your computer's name to something WITHOUT an apostrophe, and using ONLY characters A-Z, a-z, and 1-9. I think spaces may be OK, too, but it would probably be better to avoid them, just in case.
4. Follow these steps to erase the TM drive and start over.
NOTE: THIS WILL ERASE EVERYTHING ON EVERY PARTITION OF THE EXTERNAL HARD DRIVE.
1. Open /Applications/Utilities/Disk Utility
2. Click the drive just above your external drive-it will have a weird name, which mentions the drive manufacturer and the capacity of the drive.
3. Click the "Partition" tab.
4. Under "Volume Scheme", select "1 Partition". Click "Options", then click "GUID Partition Table" if you are on an Intel-based mac, or "Apple Partition Map", if you are on a Power PC-based mac. (check by clicking >About This Mac. Under "Processor", you will see either Intel or Power PC mentioned).
5. Click "Apply"
6. Click the (indented) drive you want to back up to, and select the "Erase" tab. Under "Name", type the name you want, and for format, select "Mac OS Extended (Journaled)".
7. Click "Erase".
8. Enable TM (by sliding the switch in step 1 to "On"), and select the external drive to back up to.
Good luck!

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