The Sentinel service failed to start

Hi all,

Just did a fresh install on my Windows Server 2003 R2 SP2 x86-64 system (all patched till today).

Installed the xMatters 4.1 with all new and shiny installer (xm410-Windows-Win32(NewInstaller Build 549)).

After installation of xMatters Web/App/Not on the same server I rebooted and ended up with a Service Control Manager event:

The Sentinel service failed to start due to the following error:

This driver has been blocked from loading

Never used the Sentinal service/package before... does anyone know why it does not start?

Thanks in advance for any reply!

Kind Regards,

Jeroen van de Hoef