Hi,
I understand that you are having issues installing a HP Color LaserJet 3600n on Windows 8. Are you trying to connect the printer via the network, or USB?
I suggest checking to make sure you have downloaded the correct driver package for your version of Windows 8 (32-bit or 64-bit) from this drivers download page: HP Color LaserJet 3600n Drivers
Once you have downloaded the correct driver package, as Oldscout suggested, definitely check to make sure you have extracted the zipped installation files.
Also, this support documentation might help you: HP Color LaserJet 3600n - Install the HP driver created for Windows Vista to print in Windows 8
Take care