Welcome to my world...After spending hours racking my brain on this one, I gave in and called Microsoft. I spent 11 hours on the phone before they figured out that the print subsystem was corrupted. They ran a tool called 'cleanspl.exe' on the server. It deleted the entire print spooler, and re-created it. That solved the problem. Interesting enough, mine also happened after that Windows Update. Also, for some reason, I was still able to print to my networked Dell Printers, just not to my networked HP Printers. Also, interestingly enough, I am back today, because some of the workstations decided to do the exact same thing. I ran the tool, reinstalled the printers, and am back in business. Hope this Helped you out! Ashish