I have a printer connected through a tower with windows Vista and am able to share wirelessly with my wife's laptop which also has vista (it shows on the one care circle).
I have a MacBook Pro. I can access the internet through my router, but I cannot figure out how to print wirelessly?
To print to the printer wirelessly from the Mac, the printer needs to be shared from Vista. This isn't a OneCare Printer Sharing issue as printers can only be shared to PCs in your Circle, which won't include the Mac.
I don't know how to set up a Mac to print to a network printer that is being shared out by a Windows PC, but you can at least make sure that it is being shared out.
Go to Printers/Properties/Sharing on the PC where the printer is attached and follow the Wizard to make it a shared printer on your network outside of the OneCare sharing feature.
-steveMicrosoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator