My orbit tool isn't responsive

I 'm not easily able to get the view of my model that I want with my orbit tool. I’ve never had this problem before. I’m new to SU and totally self-taught, so please don’t be cruel, OK?

Please help us help you! Your post is pretty vague…could you describe more fully what you are trying to achieve (“the view of my model that I want” = ?), how you went about it (where did you click, how did you move the cursor, etc.), and what results you got? A screenshot would help.