After you file

I have saved the final versions of pdf files (which are nothing but the tax return reports) for the years I am interested in (past 6-7 years for example). 

I have saved each of those .tax files as well as .pdf files

What I do not have backed-up are the installation files - because I didn't know how to back them up and/or figured I had the CDs (which now I have realized that I have misplaced them). 

 

I do have the old hard drive handy that I can hookup as a zip drive to my laptop currently. Assuming the installation files are there on that hard drive, where and what files (file name patterns/file paths/file name extensions etc.), am I looking for?

Thanks,