Looking for some software

I have been using some form of the MS flight simulator for over 20 years. I recently purchase a new computer with Windows 7 pro loaded. Initially I found that my copy of FS2000 was having trouble loading and working. I then discovered that some time back I had purchased FS2002 and it loaded with no trouble on my new computer. It wasn't long before I started looking for some new planes to add to my library which lead me to Simvation. I have downloaded 20 or so planes and have had varying degrees of success getting the files in the right places. Some don't show up on the list of planes and others have blank instrument panels. I don't know whether the problem is with the files or my lack of understanding precisely where things go. So I looked around a while and found the Air Man program which I thought was an auto loader but it has a problem when I try to install an aircraft a message comes up "Flight Simulator folders not defined" and that is where I am stuck.
Is there a software download that will install the planes I have already downloaded?
Is there a software download that will install the planes I have already downloaded?