Just to let you know - in the first attempt by the end of system installation my WIN 7 RC did not recognize printer (USB) and I was advised to install driver
As you know HP software is "heavy" and moreover in the end i got the message that installation was unsuccesful (3 files listed in red).
It was not nice.
And next morning I have found in system winupdate window an update for HP printers 5900 series. Quick installation and it works.
So be patient and keep trying.