If you are using a Dell machine, you might be running into the following issue.
Several users have reported encountering similar issues with MATLAB R2015b on Dell machines. If you are indeed using a Dell machine, would it be possible for you to uninstall the Dell Backup and Recovery tool?
Please take a look at the external bug report at the following link:
The fix for earlier versions is to uninstall Dell Backup and Recovery Tool.
Please let me know if this resolves the issue.