How can I uninstall the trial version of Lightroom 4.2?

I cannot uninstall the program via Windows Vista's "Uninstall or Change a Program." When I try the Uninstall command, I get this message: "The system administrator has set policies to prevent this installation," then this message, "You do not have sufficient access to uninstall Adobe Photoshop Lightroom 4.2. Please contact your system administrator." When I try the Change command, a wizard appears with the options to either Repair the program or to Remove it. When I select the Remove option, I end up with messages similar to the above and a fatal error message (#1730, I think).
I am the sole user of my machine and its administrator. Is there an alternate method for uninstalling the program (apart from deleting everything and cleaning up the Registry)?
Thanks.

In case someone is interested, I found a solution.
1. Recall that when you extract the installation files from Lightroom_4_LS11.exe, you get a PDF file, Install Lightoom 4.exe, and a folder—Adobe Photoshop Lightroom 4—that contains setup32.exe and setup64.exe. (I used Install Lightoom 4.exe to install the program because that seemed the obvious way of doing it.)
2. Double-click one of the setup.exe. (In my case, I double-clicked setup32.exe.) A Wizard appears. This is the same Wizard that you get when you use the Change option through Control Panel > Programs & Features (which did not work, as mentioned in my original post).
3. Select the Remove option. This time, it works. At least, it worked for me.

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