In July I purchased a Siemens speedstream 6520 through Valor Telecom(now Windstream Communications). It worked perfectly. We changed phone companies and DSL service and now the modem won't work with the new service. How can I set it up with the new provider? I have the IP address and all that stuff but it still doesn't work. A regular modem connects, but I would like to use the wireless since we have 2 computers and an xbox 360. I would rather not pay for another one. Please help!