i'm having the same issues. i've worked on roughly 5 different vista machines from home to ulitimate. none of which i'm able to connect via wireless. for a brief moment i did get the ultimate machine to connect w/ wireless but upon more printer troubleshooting i lost the connection. hard wire though works as like it should. each time i try connecting with the user's credentials i get the following: Windows cannot connect to this network. The root certificate on the server required for authentication cannot be found in the certificate store.