Supported operating system:

Windows XP 32-bit
Windows XP 64-bit
Windows Vista 32-bit
Windows Vista 64-bit
Windows 7 32-bit
Windows 7 64-bit
Windows Server 2003 32-bit
Windows Server 2003 64-bit
Windows Server 2008 32-bit
Windows Server 2008 64-bit

Release note:
HP Designjet 90 printer PCL3GUI version 7.00 driver for WinXP/2003/Vista/2008/Win7-32&64 released on 29th July 2010.

Supported Devices:
HP Designjet 70
HP Designjet 90
HP Designjet 90r