1. Exit out of SOLIDWORKS 

2. From the windows start button, type "regedit" and run the registry editor. 

3. Navigate to the branch "<HKEY_CURRENT_USER> software/SOLIDWORKS/solidworks20YY/user interface 

4. Rename the branch "commandmanager " to something like "Old_commandmanager". This will cause solidworks to reset the tab list 

5. Exit the registry editor 6. Start SOLIDWORKS