To reinstall the Solidworks application can be an upsetting thing to do. First of all you have to be prepared to loose all of your beautiful 3d CAD drawing - there is no room for second thoughts. The easiest thing to do is to boot your computer system in MS-DOS. To do this you have to press the F8 button at startup, and choose the MS-DOS option. Then write "format c:" and press "yes". Now you just have to reinstall all your applications including MS-DOS, Windows etc.
Hans Heidenberg, IT-Support