Installation Problems

I had to erase the hard drive of my computer and re-install applications.  I located a download of Acrobat 8, which is what I was running before the hard drive erase.  It opens fine and I get to the screen where I can input my Serial Number, and click continue then I can choose to add PDF Printer or something, but the installation never fully finishes from there.  I am left with just the word "Acrobat" in the upper left hand corner.  You cannot click on it for the drop down menu and nothing else ever appears.  I then have to force quit.  When I open it again, it opens fine and goes through the whole process again.  I found a link with all of the patches from 8.0.0 on up, but they do not install properly after 8.1.1 saying I have modified something. 

I just want my Acrobat Pro to work as it did before.  Please help! 

The alternative is purchasing the new subscription software at $180 a year.  It was working fine before my hard drive crashed.