Paul B., You say that you do not have the problem of a bad install. So you have not seen the sequence of this problem. I am surprised at the speed that the error message appears. Using a double click on the file in Explorer or from the command line in Run the error message is as quick as the release of the mouse botton. But if in Explorer using Find to find the file uftree.exe takes my system almost to the count of three to find the two version I have on my system.
After the first error message the pick a file box opens to select uftree.exe. The error message here is also a quick one.