Hi,
The problematic file is Kernelbase.dll which is part of the Windows OS and is used for handling graphics. That´s probably why the NCS service is running, but when you start the Windows client that crashes.
Most likely it´s been an update of the NET Framework and therefore a mismatch with the dll file.
Here are some suggestions to fix this.
-start the NCS installation program and select remove. When finished install again. All configurations are kept, but the windows client is re-installed.
-uninstall the latest update of NET Framework. Make sure NCS runs. Do the Windows Update again.
-follow my post in this NCS Server stopped starting - Windows Update is playing some tricks on Netcam Studio
-Henrik