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Outdated Drivers Can cause hardware related Errors. Check your PC Drivers now.

Error 743

1.  Usually this means that the server is asking for secure password authentication.  Usually ISPs do not require this, probably about 99% of them.  Make sure that the correct number is being dialed.  Could be an ISP issue?  

2.  In 95/98: Check dialer and make sure that "require encrypted password/use secure auth" is not checked.  In NT: check dialer and make sure that "Accept any auth including clear text" is checked.