Outlook 2007 99-100% CPU utilization

Hi,

I am having the following problem with Outlook 2007. Whenever I run
outlook the CPU utilization goes up over 99%. I’ve been using OL 2007
for over 4 months and it was working fine.

Tried repairing/recreating the OST and PST files.
Tried disabling all Add-ins (LinkedIn, Outlook Connector, etc.)
tried running Outlook in Safe Mode.

Nothing seems to work.
Anyone has any ideas as to what might be wrong?? I havent recently
installed or uninstalled anything on my machine.

I am running Windows XP with Service Pack 2, Norton Antivirus,
RealSecure Desktop protector