Sorry that you are having this problem with the printer not being found from the computer.
See if you can plug it in with USB and can print. If so, then it would be something on the network that is blocking the printer from being seen by the computer.
You can try to disable the firewall and anti-virus.
You can also run the print and scan doctor and check the results.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c03275041