first things first - what error message do you receive? if you don't get one, try and re-send one of the emails in your outbox and then double click the bottom right hand corner of the screen - send and receive - and press cancel
secondly who is your isp provider?
thirdly for now - did this start ONLY after you installed your new software or is this just a coincidence?
-------------------- XP Home
Office Pro + FrontPage, IE6
AVG, Zone Alarm