'Secure Boot helps increase the security of Windows 8.1 and Windows RT 8.1 PCs by stopping unauthorized software from running. Some Windows 8.1 users are reporting that they have a watermark stating 'SecureBoot isn't configured correctly.' Here is why it appears and how you can fix it, for now at least. However, there is one annoyance that has poped up regarding Secure Boot, leaving an annoying watermark on the desktop. For those who were one of the lucky ones to successfully download and install the Windows 8.1 update while numerous users are experiencing difficulties, you are likely to be enjoying all the new consumer requested features that the update brings to Windows 8.