HP Deskjet 3940 Driver

HP Deskjet 3940 Color Inkjet Printer Driver for Microsoft Windows and Macintosh Operating Systems.
HP Deskjet 3940 Driver Downloads
Operating System(s): Windows XP
- HP Deskjet 3940 WinXP Printer Driver Download (45.32 MB)
Operating System(s): Mac OS X 10.6, Mac OS X
- HP Deskjet 3940 Mac Printer Driver Download (23.64 MB)
This driver works both the HP Deskjet 3940 Printer Download.

It is an excerpt.
How to install? (HP Deskjet 3940 Driver)
I changed Window from XP to Window 7 and supplied CD does not work.