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I like Bacon said:
Geek Squad found no virus. Time Warner just gave us a new modem as that is what we thought it originally was.

I dunno.

and how do I download something and transfer it to my computer at home?

A USB key, floppy disk, CD-R, SD card or any other data medium.  If you read the link I sent, there are instructions on how to get your PC access to the internet and download it from your PC.  Like I said, there is no guarantee this is the problem because you haven't provided a lot of symptoms.