Unable to send emails, able to receive emails

Hi

I have always been using Thunderbird 3 on my Vista machine. Bought a new laptop that came with Windows 7 Starter version.

Realised that whenever it on the new machine (Windows 7 starter), TB cannot receive emails (error message : An error occurred with the POP3 mailserver. Mail server pop.winetatler.com responded: ) , but it is able to send emails. Thought that the program got corrupt, so plugged it out and tried it on my Vista machine. It worked perfectly in sending and receiving emails.

There must be some problem with compatibility with the new OS (Windows 7). Can someone advise me what to do ?? Thanks.

Best regards
Arthur