Install Error

Hi,I know this is not the Reality XP forum but this problem is driving me nuts !!I have a fresh install of windows 7-64 bit. I have reloaded FS9 and FSX with all the bells and whistles(Addon's). Have not had a problem. Purchased the Reality XP 530 WAAS and the main gauge installs but when I get to the install of the Garmin Trainer I get an immediate error - Error number:0x80040707 - Description: Dll function call crashed: Isrt.PathGetSpecialFolder.I have been to the Reality XP forum and Jean-Luc says this is a windows error. I have been on google trying to root out the problem. Have checked out the registry, safe mode, disabled UAC,anti-virus, etc. Google points to a installsheild problem. Just wondering if anyone on this forum had a similar problem? This is the only program that I installed out of over 25-30 programs on a clean install of windows 7, that I have had a problem with.Thank-You for any helpTed