invalid credentials

My problem started on Friday the 11th on my workstation at work. Five other computers with xp and two with vista are having no issues. All are Office 2007. My error message is “Your IMAP server wants to alert you to the following: Invalid credentials (Failure)” I’ve done everything I can think of including a full uninstall reinstall of Office 2007. Disable and re-enable IMAP on google, reset and changed the email password. This account works fine from my Vista and Outlook 2007 from home. It’s just my PC at work. I guess I’m looking for some way to clear the user info from Outlook. I have deleted and recreated the IMAP account in Outlook several tims