Re: DSL ?
With limited knowledge this could be a little tough.
Is Cavalier a reseller? Or are they the actual phone company where you are? If the phone lines are theirs, have they tested it outside your house? Have you asked any very nearby neighbors with DSL if they're having trouble? Has anyone told you the physical distance you are from the central office (I think there's a way to determine this online for some phone companies; check your phone company's home page/DSL info; 15k-18k feet is just about the technical limit).
If the problem is inside your house it could be very many different things: the transceiver (box) you got with your DSL service could be faulty; how is it plugged into your computer (USB or a thick line with connectors a little larger than regular phone cable)? how long is the connection between your computer/transceiver and transceiver/phone jack (should be as short as possible)? Do you have the filters installed correctly on the other lines in the house (they're marked with an arrow IIRC)? Do you have a filter on the DSL line (you do not want one there)? Is the transceiver line running directly into the phone jack or does it pass through a phone/fax machine, etc. (if so, try straight into the jack and see if that improves things) Who set this up? Phone company? Have they ever witnessed the trouble you're having?
It could also be your computer/windows: is there any way to connect without DSL (i.e., do you have a normal modem installed you can test with)? Did you have anything at all similar to this before trying DSL? Has it EVER worked reliably?
Mike
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