eriqjaffe, correct me if I am wrong.
AFAIK, The installation of Adobe Reader 7 uninstalled or upgraded Adobe Reader 6. I presume installing Adobe Reader 8 will uninstall or upgrade versions 6 and 7. If that is true, I do not see the need to uninstall versions 6 or 7.
If versions 5 or older are installed on some computers, then they need to be uninstalled first.
I would also try to avoid the Gosub statements