I have found the Windows 7 compatible driver
for my Deskjet F4280 here: Vælg software og drivere HP Deskjet F4280 All-in-One - HP Teknisk Support (Danmark - Dansk)
I have chosen the correct system (Windows 7 64-bit) and successfully downloadet the 204 MB file (after a couple of interrupted downloads). But when I try to run the file very fast I get the message (in Danish "Udpakningen mislykkedes"), which more or less means "Unzipping failed".
I have tried to run the update from Vista to Windows 7 (though the computer is 'born' with Windows 7), but that doesn't help either...
Before all this I have installed the driver from the cd-rom disc which came with the printer, not knowing that it didn't wotk with Windows 7
Any good suggestions???
The alternative would be to buy another printer - but no printer is yet sold in Denmark with a Windows 7 driver!