There might be a modem setting (see the modem or connection properties) to automatically disconnect after ... minutes of inactivity. Maybe it helps if you disable that? But if it happens during browsing it's not right.
There might be a combination of settings in Outlook Express. Automatically check every 20 minutes and disconnect after send/receive. This is expected to work only if you have Outlook Express open while surfing.
The disconnect might be caused by a bad line condition, but if it's each time after 20 minutes, it's not likely.
Have a look in the modem log, and see if it reports anything interesting about the problem.
And how do you do the dial-up? Automatically from IE, or manualle from Dialup connections or a shortcut to that icon on the desktop. Try the last and set IE to 'never dial'.
I don't really expect all of this to help, but it just some thoughts.
The past week or so I lose my internet connection after about 20 minutes. It cuts off then automaticly redials my isp. Is there a setting that can change this?
Thanks for any help