You might try creating a new connection and set it as default. If it's working, you can get rid of the old one. For details, read one of the below articles:
Q305549 - "HOW TO: Configure a Connection to the Internet in Windows XP Professional"
Q310410 - "HOW TO: Configure and Use Dial-Up Connections in Windows XP"
Q283070 - " HOW TO: Create a PPPoE Connection in Windows XP"
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
Running Windows XP Pro, when trying to connect I find that the password has been duplicated, and have to go into Internet options, settings and delete the double password to be able to type in a single password in Speedtouch dialup. Could anyone explain why, and offer a solution to fix the problem?.