After closing down internet I cannot reconnect I have to contact isp to get back on line.I am using Dell inspiron 1520 running vista and connection with router is working.I am just new to computers can anyone help. Thank You.

What does the ISP do or has you do that reinvigorates your connection?

Go into ADSL settings and set VPI &VCI settings which I have never changed and have to connect to router with ethernet cable.It seems something is not saving settings I'm new to computers so don't know much.Thanks for reply

If the ISP provided the router, I'd firmly request a new router from the ISP. Also, for an ADSL connection what do you mean by "after closing down Internet"? DSL connections are generally always on in the sense that the router dials up the connection as needed without any startup or shutdown actions on your part.