Again, I may be stating the obvious, but click on start, then printers & faxes, find your printer in the list and right click on this now click on properties then services. With a bit of luck this should give you, not what you may need, but the opportunity to clean the heads. Do this and you will then get a test printout which will indicate if you have a head problem. The only problem is that I am describing how to do it with an HP 895 CXI, so there may be differences once you get beyong the "right click" bit.
P.P.