As a test and if there is just one user, you may want to try - disable Switch User Option
http://www.askvg.com/how-to-disable-...s-vista-and-7/
But I think that something else is going on here and checking the file system would be my first port of call.
http://www.askvg.com/how-to-disable-...s-vista-and-7/
But I think that something else is going on here and checking the file system would be my first port of call.