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 Deskjet K109a printer version 14.1.0 driver for Win2000/XP/XP-64/Vista/Vsita-64/Win7/Win7-64 released on 31th July 2010.

What's new:

1. Improves Windows 7 Support
2. Improves Network Installation and Networking Functionality for Network connected products
3. Includes HP Smart Web Printing 4.60, which improves IE 8 support and adds Firefox 3.5x support

Supported Devices:
HP Deskjet Ink Advant K109a-z
HP Deskjet Ink Advant K109a-z (DOT4USB)