the Comcast people be very pleasant but could not get the modem to work . then , I use the following sequence -lrb- page 10 of the download manual -rrb- , and the modem start to work : configure tcp\/ip for Windows 7 1 . click Start and then click control panel . 2 . click Network and Internet to display the Network and Internet window . 3 . click Network and share Center to display the Network and share Center window . 4 . click Change adapter setting to display the lan or High-Speed Internet connection window . 5 . right-click the network connection for you network interface . 6 . Select Properties to display the local area connection Properties window . 7 . Select Internet Protocol Version 4 or 6 -lrb- tcp\/ipv4 or v6 -rrb- and click Properties to display the internet Protocol Properties window . 8 . Select Obtain a IP address automatically and obtain dn server address automatically . 9 . click ok to save the tcp\/ip setting and close the internet Protocol Version 4 -lrb- tcp\/ipv4 -rrb- Properties window . 10 . click Close to close the local area connection Properties window . 11 . close the remain window and exit the control panel . when you complete the tcp\/ip configuration , go to verify the IP Address for Windows 7 . the modem do not come with a cd or manual .