Flight Simulator 2004 add-ons

When attempting to install add-on scenery which has been downloaded into my scenery library I run into a wall. When the desired scenery is 'selected'
the text in the 'directory' box at the bottom of the page appears in black and white as always. But when I hit the 'okay' key to complete the process the text is covered by blue highlite and the download fails to be added.
I am useing a new PC with Windows Vista, the game was originally downloaded into XP and then transferred to a remote hard drive for back up purposes in case anyone thinks that could be the problem. I might add I've downloaded several add-on aircraft without problems and all other functions of the simulator are working normally.

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I had been running the FS 2004 in Flight Simulator safe mode until I discovered that Aero was creating a problem. When I switched to Vista Basic it worked fine and I have had no further problems.