[Background: 32-bit IE found at C:\Program Files (x86)\Internet Explorer\iexplore.exe. 64-bit IE found at C:\Program Files\Internet Explorer\iexplore.exe.]
STEP 1
Navigate to C:\Program Files (x86). Hightlight the "Internet Explorer" folder and rename (right-click...Rename) it to "Internet Explorer 32".
[Philosophy: Try to avoid actually deleting system files. Make it simple to return to if needed.]
STEP 2
Navigate to C:\Program Files. Note the "Internet Explorer" folder. Copy it to C:\Program Files (x86) by your preferred method. E.g., drag and drop is one way, or right-click on it, select Copy, navigate to C:\Program Files (x86) and Paste is another.
[Comments: a. You can choose a different folder name for the rename in Step 1. I just like to be obvious.
b. You can check after the rename of Step 1 by clicking on a link if you've put Favorites in your Start Menu--you should get an error message and the program won't launch.
c. Why not just rename the iexplore.exe instead of the whole folder? Because I'm dumb enough not to know for certain whether any of the subroutines (.dll files and the like) in the 64-bit folder might also be optimized for 64-bit operation. This way, I think I've covered it all.]
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