Using addon scenery in Vista

Recently I purchased a new computer. Unfortunately it came equipped with Vista Premium Home Edition. I installed FS9 and to my surprise it worked great. Fast, smooth beautiful..... I have started putting in addon scenery - freeware and payware - and have run into a problem. When I add scenery in the scenery library they do not save. The files save in the addon folder just not in the priority list. Some do and some don't. I go back into FS9 and try to add them to the library again, restart the sim and the newly added airport or mesh are not in the list and when I load the airport it is not there. Any ideas or should I go out and get FSX.ThanksGraham