The following error message may be displayed when installing ActivDriver 5.15.10:

"Service 'ActivControl' failed to start. Verify that you have sufficient privileges to start system services."

Cancel the installation and verify that you have installed any outstanding Windows Updates, so that your computer is up to date. 

Should the problem persist, you will need an additional update for your computer. Download and install the vc_redist.x86.exe file, even if you are running a 64-bit operating system.