Windows cannot verify the digital certificate

Having installed our STU or Signature SDK you may encounter the following error message when trying to run an application which has been built with them:
 

    Windows cannot verify the digital certificate for this file. A recent hardware or software change
    might have installed a file that is signed incorrectly or damaged, or that might be malicious
    software from an unknown source.

 
This situation was first encountered after applying a stricter digital signing method to Wacom executables and DLLs and is mainly found on Windows 7.
The additional protection was applied to prevent the possibility of files being modified.

The error message will not be reported if Windows has been fully updated using Windows Update.
If it is not possible to apply the full Windows Update, this specific update will usually resolve the issue: KB 3153171

The update can be downloaded from Microsoft.com:

• KB 3153171 - 32-bit

• KB 3153171 - 64-bit