Hi dee, i see on HP's website there is a driver for the said printer, there's also a patch available if you have upgraded from vista too Win7 i.e. if you havent done a clean installation.
As Linny also said about 32 and 64 bit operating system i believe the driver and patch are the same and that 64bit os from what ive seen get the same error message anyway.
The first thing i would do is uninstall the printer
Start up the computer with the printer attached
I should have asked this already but does the printer show up in device manager? (start,right click computer,select manage then device manager)
If it does, right click the printer and select uninstall
The printer will then reinstall itself automatically
Download the driver from
HP's Website selecting which operating system you have just incase there is a difference in the driver for 32 and 64bit os.
Do a restart after installing the driver
Test the printer with various printing options like text, word docs, pictures (youll have no ink left after this :) )
If everythings going ok then brill, if not then apply the patch offered on the same page as the windows 7 driver on HP's website
Hopefully everything will be back to normal for you after this.
Let us know if you did just upgrade or if it is a clean install of Win 7 you have and if its 32 or 64bit ;)
p.s. the patch i mention is named UPDATE on the website