Acrobat 8 is pretty old and no longer supported by Adobe.
Have you checked to see if Acrobat 8 is compatible with Windows 7?
Adobe product operating system compatibility
Since Windows 9 does not show compatibility with Windows 7 I doubt that an even earlier version of Acrobat would work with Windows 7.
Acrobat 9 Standard system requirements
Windows
•1.3GHz or faster processor
•Microsoft Windows XP Home, Professional, or Tablet PC Edition with Service Pack 2 or 3 (32 bit and 64 bit); Windows Server 2003 (32 bit and 64 bit, with Service Pack 2 required for 64 bit); or Windows Vista Home Basic, Home Premium, Business, Ultimate, or Enterprise with or without Service Pack 1 (32 bit and 64 bit)
If one update Acrobat 9 to version 9.2 then Acrobat 9 is compatible with Windows 7.