Migrating from OE6 to Outlook 2003

I have just purchased the MS Office 2003 standard edition
which includes Outlook 2003. I was previously
using Outlook Express. I had so many problems after
trying to migrate to Outlook 2003 that I ended up
uninstalling all of MS Office 2003 then reinstalling it
without the Outlook 2003 piece. This means that I am
stuck with Outlook Express, which is obviously less
powerful than Outlook 2003 but it doesn't seem to be
worth the apparently enormous effort to fix all of the
problems which I have when I try to install Outlook 2003.
Any suggestions ? Here are the kind of problems which I
had when I tried upgrading to Outlook 2003 from Outlook
Express. . .
1. My Download Accelerator program stopped working, so I
couldn't download any files from the Internet.
2. Every time I opened Outlook 2003, I would get the
error message "this application has requested the runtime
to terminate in an unusual way", though I seemed to be
able to continue to open Outlook 2003 after acknowledging
the error message.
3. When openinig Outlook 2003, I would also often get the
error message "Outlook experienced a serious error last
time the add-in NORTON ANTISPAM . . . ".
All of these problems disappeared as soon as I
uninstalled Outlook 2003 and went back to Outlook
Express. Can anyone send me a link to some detailed
information on migrating from OE6 to Outlook 2003 ?
Thanks