Windows BUG: Can't change file types through control panel Quicktime settings

I am running the latest version of Quicktime on Viista Home Premium 64-bit.
When I into Control Panel -> View 32-bit Control Panel Items -> Quicktime -> Browser, and I click on "File Types" or "MIME Settings", I get a blank page that looks like this: http://oi40.tinypic.com/hvbbia.jpg, and Quicktime momentarily freezes.
I have no issue adjusting file type settings when bringing up Quicktime outside of control panel, or when using "Default Programs" within control panel, it's only when I do it within "View 32-bit Control Panel Items" that it does this.
This is a minor bug but still weird. Can anyone else verify the issue? I tried uninstalling and reinstalling but that didn't help.

This could be caused by damaged QuickTime preference files (or possibly a permissions problem on the preferences files).
We can try rebuilding one set of your preference files to see if that helps with the greyed-out stuff.
First, quit QuickTime if you have it open.
Next, you'll need to make sure you are set up to view hidden files and folders in Vista (or 7).
1. From the Start menu, click Open.
2. In the Organize menu, click Folder and Search Options.
3. Click the View tab.
4. In the "Advanced settings" pane under "Hidden files and folders" make sure that the "Show hidden files and folders" option is selected.
5. Click OK.
Next, you'll remove the QuickTime preference folder (and contained file).
6. In Computer, open Local Disk: C or whichever drive your documents are stored on.
7. Open the Users folder.
8. Open the folder with the name of the Windows 7 user account in which the QuickTime file types are "greyed out".
9. Open the AppData folder.
10. Open the Local folder.
11. Open the Apple Computer folder.
12. Drag the QuickTime folder out onto the Desktop.
Now you'll rebuild the preference folder and file.
13. Launch QuickTime. Check your file types again.
Are they still greyed out, or can you change them now?

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