Acrobat 8.0 does not support any version of Windows beyond 32-bit Windows XP. When Microsoft went beyond Windows XP, they changed the print architecture enough such that Acrobat's capability to print to PDF need to be significantly revised.
You didn't say how you “transferred” your Acrobat 8 from your old system to your new system, but you would have had to install it using the information supplied at Download Acrobat 8 and Acrobat 9 which includes new installation media and serial numbers (the old activation servers were decommissioned).
Furthermore, to get Acrobat 8 to work on Windows 7, you would need to subsequently update the software to Acrobat 8.1 which supports the Adobe PDF PostScript printer driver instance under Windows Vista and later.
- Dov