Help on removing widgets and another Popup problem

Hey all, new to the forums, and I'm just posting about two problems i have:

1. I want to get rid of these widgets, and I've looked up some threads about it. People keep saying to go to Home or something... sorry, but I'm not familiar with Macs (love them though). Anyone have any tips?

2. Whenever I start up the computer, there's a popup that says "Can't listen for popups..." and then something about a printer. No technical problems involved though, but it is annoying. And I don't know if it's a common problem. Any help would be greatly appreciated. Thanks.