Problem description
Installing SQL Server 2012 Service Pack 3 update, and ran into the following problem:
The install package extracts setup files, flashes a command window, and disappears. Nothing appears to be installed. I tried running the package in elevated administrator mode and with the /action=Patch switch – no luck. SQL Server setup log Summary.txt contained no entries at all.
Windows Application event log showed some warnings such as the screenshot below:
(.NET Runtime version 2.0.50727.5485 – Error ‘Invalid syntax on line 166’)
Solution
This problem was fixed by running the following command:
C:\Windows\Microsoft.NET\Framework\v2.0.50727\caspol.exe
-machine -reset
If you’re using 64-bit framework, run the following command:
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\caspol.exe
-machine -reset
No system reboot was required in my case.
The SharePoint Nomad 