Helping my friend on connecting on 7290

Few months ago, I sold my Blackberry 7290 (T-mobile) to my friend but I have trouble getting the computer setup to hook up to the Internet.

I double check the "how to" post (at another forum) and everything is fine.

When I try to connect, it says,

Verifying username and password
Error 734: The PPP link control protocol was terminated

Can someone help me on this? Thanks.

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