You just updated your computer with the latest Microsoft updates (Jan 11, 2011) and now when you search for an email in your Outlook Inbox or archives, you find that Outlook crashes and closes and restarts!
I don’t have a fix for this per-se except to advise you to uninstall the offending update: KB2412171
To do so, you must open up the Control Panel and click on Add/Remove Programs. Check the box for Show Updates and wait for the list to load. Once the list displays, you can scroll down to KB2412171 MS Update for Outlook 2007. Uninstall this update and then check and see if you can search in Outlook now. If not then reboot and try again. If it still doesn’t work then this issue wasn’t present on your computer.