On behalf of Adobe …
Yes, due to the shutdown of the activation servers for Acrobat 7 and CS2, Adobe has provided an alternative at Download Adobe Acrobat 7 and Adobe Creative Suite 2 products per Gene's posting. That deals solely with the issue of serial number and activation.
However, Acrobat 7 was never, repeat never, repeat yet again never fully installable or operational under Windows 7. You may have been able to get the actual “Acrobat” program to install, but a key portion of the software, the Adobe PDF PostScript printer driver instance from which you could “print” from any application to produce a PDF file simply does not fully or properly install in any version of Windows beyond 32-bit Windows XP and certainly not on any 64-bit version of Windows (including Windows XP).
The first version of Acrobat that will fully and properly install on Windows Vista and beyond and all 64-bit versions of Windows is Acrobat 8.1, an update from Acrobat 8 as originally released. (This had to do with changes in the print spooling system from Microsoft as well as issues of dealing with a 64-bit OS!)
Perhaps your Windows 7 system was an upgrade from Windows XP? If so, that might explain how you got the installer to work last time (i.e., Acrobat was installed while it was still Windows XP?!?).
How can you install it partially now? Perhaps try running the installer as Administrator and/or disabling UAC (User Account Control)?
All that being said, you are dealing with software that is five major releases out of date, not compatible with your operating system version, and definitely not supported by Adobe Systems in any way, shape, or form. This is a situation where you really need to license the current version (Acrobat DC, previous versions are no longer licensed anew) to properly run on your system.
- Dov
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