Outlook will not open

I recently purchased a new computer which had a trial version of Outlook. I
purchased MSOffice XP and installed (hindsight I should have deleted trial
first). Outlook will not connect to mail server, in account when test
settings says "can not open outgoing email address incorrect" however I can
run Outlook express and retrieve/send email. I uninstalled both trial and
purchased version and reinstalled but still get same error when testing
account. Another weird thing is I can open Outlook but not change view to
incoming, address book, calander,etc. Any help would be greatly appreciated.