I am assuming you are using Win7, possibly the 64-bit version. If the latter, you may be totally out of luck with AA7. It might be possible to run it as the 32-bit process that it is. You may also have to set a compatibility mode. In 32-bit windows, the Adobe PDF printer should appear in the printer list, but it may fail. If it fails, it is due to AcroTray not being compatible with Win7.
So giving some more information about your new OS and such might help us help you. The answer may be to simply upgrade while you still qualify (AA7 qualifies for the upgrade price to AA X).
Thanks for the insights. Yes, I am running Win7 64bit, (brand new computer after a crash), as well I am running virtual XP Pro as I have some proprietary programs. I have thought about an upgrade and will if it will for certain solve the issue... and I cannot afford for it to be hit and miss.
My guess is that AA7 will not work properly on the system. If the Adobe PDF printer does not show up, that is a problem. You could print to any other generic PS printer and open the file in Distiller to create the PDF, but that is not convenient and may miss a bunch of the features of Acrobat. AA7 is not supported on Win7, and so you are probably best upgrading.