Vista Ultimate – Network Printer “Offline”

Hi,
I have several computers on my home network. 2 Vista64, 3 Vista, and 3 XP (1 Home & 2 Pro).
I have a Canon MF5770 all in one that is network ready. I’ve been using the printer for couple years with no issue. Last night, something happened and now the printer appears “Offline” for all of the Vista computers. All of the XP computers still see the printer “Ready” and can print to it. I assume some patch must have installed or something, but I have tried reinstalling the drivers. All of the machines have the same printing setup to TCP/IP. The printer has a fixed IP address. It can be pinged from the Vista computers but does not appear in the Network.