My printer used to print documents wirelessly just fine on my HP C6180 printer. I use a Motorola SB5120 cable modem and it's connected to a Motorola WR850G Wifi router.
After first installing my Zonealarm firewall (version 8.0) was when I started having issues. At first it did allow me to print files, however it would print the same documents over and over again. Now the print commands aren't even going thru.