I have Office 2003 on a Windows 7 computer.

About 5 or so months ago, Outlook started acting very strange and just recently it's acting stranger. It had been acting fine for about 10 or so months. Here are the things it's doing and below that are the things my IT and I have tried to no avail.

1. When I close Outlook, it won't close all the way so I have to CTR + ALT + DEL and close it from Processes in Task Manager.
2. When I click Contacts or Tasks, the screen shows my Inbox. We have to right click and choose, "open in a new window" for the contacts to come up. Don't think Tasks will show up.
3. All of a sudden, whole lines of emails in my Inbox will disappear and then the Outlook freezes and I parts of the program disappear and I have to close it through Task Manager.
4. I had all my regularly used folders set to View > Reading Pane > bottom and Outlook set them to "off".
5. I used to be able to catch an email in the Sent box, open it, edit it and then click Send again and the email would be sent. Now, if I open and edit it, click send, it will not send no matter what I do. It does not turn italic either which indicates it's being sent.
6. I'm sure there's more but can't think of anything else right now.....

What we've done:

1. IT has done a full diagnostic and found a couple of things out of date that he updated but nothing else. Problems still happening. He asked if I did an upgrade from Vista to W7 and think I did the first time but it didn't work so I'm pretty sure I had to do a complete W7 install not an upgrade the second time.
2. We've uninstalled Outlook and reinstalled several times.

Thank you so much for your help in advance!