Outlook 2003 slow with contacts

I have a new computer and am trying to move my contacts from another computer
to the new one. I'm trying to determine how to best get my contacts into the
"Contacts" folder without hanging my system. Whenever I get my contacts into
the Contacts folder Outlook takes over my CPU every 6 seconds or so!

After reading some previous posts, I tried saving the contacts to a .pst
file that I then opened into Outlook as another Personal File Folder. This
works well and does not take over my CPU until I try to cut / copy the
contacts from this second Person Folder into the main Contacts folder. At
that point, I have the same problem as before with Outlook taking over the
CPU.

Unfortunately, I need the contacts in the main Contact folder so that I can
link to my Treo. The set-up works perfectly on my other computer, but not
here. Any help would be very much appreciated, as I've already spent about
16 hours trying different things to get this to work. Thanks!!!