How can one get multiple computers to work with Comcast's SBV5220 CABLE MODEM/VOIP?

I did look at a similar question with responses that did not solve the problem for me. I have a D-Link switch I used for several computers when I had DSL through Verizon, I switched to Comcast which uses a MOTOROLA SBV5220 CABLE MODEM/VOIP . I cannot get it to work. I have re-set the modem and the switch. It will work with only one computer at a time  Can you please tell me specifically what to do, what to buy and how to set it up. thanks.
echofilmAsked:
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GrimReeperConnect With a Mentor Commented:
Chances are you need a router to go with your cable modem. I suggest a Linksys WRT54GL. Plug in cable from the street to modem coax probably, modem to router using cat5e/6 then cat5e/6 again to all your computers.
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