when logging into a specific computer

running windows vista , as a certain screen name the screnn goes black and the mouse pointer is the only thing visible. Logging onto that same computer with a different user account works just fine. How do i fix it
when logging into a specific computer

running windows vista , as a certain screen name the screnn goes black and the mouse pointer is the only thing visible. Logging onto that same computer with a different user account works just fine. How do i fix it