windows xp professional
Go to the Microsoft Automated Troubleshooting Service (MATS)
Right Click, choose Properties
Under the General tab make sure the Start Up type is Automatic
Go next to the Log On tab
Choose "This Account" button and type in "NT AUTHORITY\System" (no quotes)
You'll be asked for an admin user password and will be required to confirm the password
If successful you'll be asked to Stop and Restart the service. I recommend you do so under the General Tab.