Did you follow directions exactly? HP, and some of the newer USB printers in general, have issues unless you go through the setup steps exacty in order. Don't skip ahead and plug in the printer before doing the driver setup for example?
Does Windows see the printer? What is the exact issue and what did you try?
You may need to remove all software for the printer you installed, remove any USB ports it installed, unplug if from the PC, and get the latest softwre for it here http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=al-72038-3&lc=en&dlc=en&cc=us&os=228&product=3811075&sw_lang=