For the record on this forum ...
I downloaded the newer 3.3.5 version 64-bit. Mike advised me that the new installer wipes the information from previous versions from the window asking for the code, so my valid code did not appear, nor did my full name, just first name (for some reason). As Mike correctly pointed out, by adding my full name (first and last) along with my valid purchase code, the 3.3.5 x64 installed correctly into both CS4 and CS5 on my Win7 computer.
Excellent, quick support! Thanks, Mike!