The problem started with the tool bars slipping out of place. They seem to be locked into place now. When I open a part, I see the part on a full size working screen. As soon as I open a sketch, the work space shrinks to a 1 mm bar at the bootm of the screen. The rest od the screen in soccupied by an exxpanded space for the tool bar.
I re-loaded Solidworks 2010, but the problem persists.