My first recommendation is to unplug and restart the entire network (printer, computer and router) for thirty seconds. My second recommendation is to uninstall the printer, re-run the wireless setup wizard on the printer itself, and then install the printer again from the link below :
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&dlc=en&lc=en&product=2512009&
Let me know how that goes!
-Spencer