I have moved your post to the Firewall forum.
Are you using Windows Live OneCare? How is the printer attached to your PC?
If the printer is locally connected via USB, the firewall is not involved and you need to contact the printer manufacturer for support.
If it is a network printer, you may need to allow file and printer sharing through the firewall advanced settings:
Open OneCare.
Click Change Settings
On the firewall tab, click configure firewall
If the network is shown as Public, click Change Location to change it to "Home or Work."
Click the Advanced Settings button
Click Network connections tab.
If there are multiple active connections shown, you may need to disable the extras in your Windows network connections settings. (Network and Sharing Center, manage connections, in Vista; Right click My Network Places and select Properties on the Start menu in XP)
On the Ports and Protocols tab, add a check mark next to File and Printer Sharing - for subnet and Internet if the first setting alone (after all of the above are verified) does not allow Sharing to work.
If the printer is attached to a Print Server, you may also need to allow the software provided by the printer manufacturer through the firewall, along with ports. You'll need to provide lots more details if this is your configuration os just contact support.
If all of the above fail, please contact support.
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
-steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator
