These are toolbars that I never use, some that I don't even recognize. Two or three of them frequently appear at startup, usually floating undocked in my graphics area. It seems to be more common on restarting after a crash. Why? Admittedly it's not one of the greatest annoyances of Solidworks, but it does cost me time and painful mouse clicks to get rid of them.
For that matter, why does Solidworks crash so often? (I had about 10 crashes yesterday afternoon, 3 already this morning.) But I guess that's another discussion.