“Is it better to reset the router or the cable modem first or it does not matter?”
Power of ALL equipment router, cable modem, computer, power up modem only wait until all light stop flashing, than power on router wait until router is up and than power up the computer
Vista contains both the familiar IPv4 stack and the new IPv6 stack.
You do not need IPv6 at the present time disable IPv6 in Windows Vista will improve
your internet speed
Download the pdf file will tell you how to disable IPv6 in Vista