Hi gringo-32, just checked on hp website for your printer model http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&lc=en&dlc=en&product=61956
and no drivers are available for windows 7 at all.
Have found a solution for you on the hp support forums here : http://h30434.www3.hp.com/t5/Windows-7-Beta-and-test/Printer-HP-PSC-1315-and-Windows-7-drivers/td-p/107170
Seems like you can get printer to work by following the instructions in this thread.
Good Luck :-).