Supported operating system:

Windows 7 32-bit
Windows 7 64-bit

Release note:
HP Officejet Pro K8600 series color laser pinter version 13.0.0 driver for Win7/Win7-64 released on 27th July 2010.

Supported Devices:
hp LaserJet 1160 series (DOT4)
hp LaserJet 1160 series (DOT4PRT)
HP Officejet Pro K8600 Series