Do you mean you require a username and password and you don't know what they are? Or do you mean saved wifi connections or something? Or does the PC just not see the modem at all? What is happening when you're trying to do the thing you're trying to do, and what is the thing you're trying to do and in what way?
Have to be more descriptive. I could give answers that may fix random problems concerning 100 different situations that have to do with an internet connection
As far as the printer, need to know what the model number of it is.