Problem of receiving and sending mails through Microsoft Offic Outlook

I switched from Windows XP to Windows 7 in June and using Microsoft Office Outlook 7. From then I am facing problem of receiving and sending mails through Microsoft Office Outlook. Several time contacted 1218 help line but they could not solve my problem. I mailed to dsl.support@ptcl.net.pk they also could not solve my problem. Asfar my settings are concerned incomming server is imap-pop.ptcl.net outgoing smtp.relay.ptcl.net.Any advise.