Modem problem when connecting Broadband Internet

I am regular gust user of this site. But I can’t access regularly. Because out of net connection. I used to use Broadband internet connection. I can’t get any connection. I contact with net provider they told line is ok; problem may me on my computer. When I try to connect Error 651 shown, like this image

Connecting through WAN Miniport (PPPOE)…
Error 651: The modem (or other connecting device) has reported an error.
Give me a solution and make be connected. My operating system is Windows 7.
