My 3000H will no longer connect to the internet via my cable modem - help please.

I have 3 computers and a media server on a Linksys router with a Comcast cable modem. Everything AOK. 3 weeks ago my Lenovo 3000H shut down and rebooted for no reason. Then I began getting popups while I was on the internet saying that I needed to click on a button to make a dial-up connection. I would hit X or Cancel to make it go away. It happend more frequently and other related popups started, but I could close them and continue normally. Last weekend It happened again but I lost my connection to the internet and it would not reconnect. Now I get a big error message "Connecting through Wan Miniport(PPPOE)... Error 815: The broadband netowrk connection could not be established on your computer because the remote server is not responding. This could be caused by and invalid value for the "Service Name" field for this connection. Please contact your ISP and inquire about the correct value for this field and update it in the Connection Properties..
I called Comcast. They don't have a clue what Error 815 is. I have changed every cable, rebooted the modem, router and all computers countless times, and reset the modem per Comcast. I have taken the router out and connected directly into the Lenovo. I have gone through every screen related to broadband connection to no avail although, being a beginner, I see screens that I have no clue what they do.I have a couple of friends and a Comcast fellow who tried to walk me through the steps they thought would restore my connectio. No luck.
Can anyone walk me through the necessary steps to get me back to ground zero and then through the steps to reestablish my broadband connection?
Help Please?

Emma-
In Safari, press on the Bookmarks icon and select History. Then press on Clear History at the top of that menu, and see it there is any improvement.
If not, try unplugging your WiFi router for a few seconds. Then reset the iPad's network. Go to Settings-General-Reset-Reset Network Settings. You will need to reconnect the iPad to WiFi.
Fred

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