Symptoms
When you try to start theSearch service in Microsoft Office SharePoint Server 2007, you receive the following error message:

An unhandled exception occurred in the user interface. Exception Information: OSearch (AccountName) In this error message, AccountName is the account name that is used as the Farm Search Service account.
Resolution
This behavior occurs ifyou do not use the “domain_name\user_name” format when enter an account namein the User name field.This field isnext to Farm Search Service Account on the Configure Office SharePoint Server Search Service Settings on server ServerName page.