Cannot Connect to SQL Server

Hi

I am using Windows 10 and I recently got an update and I am not able to login to SQL Server 2014. It gives me a 'error 26'.

I tried to uninstall and install it again, but I am still getting the same error.

I went into services and tried to start my SQL Server Agent, but I get the error - SQL Server agent on local computer started and stopped. Some services stop and stop automatically if they are not in use by other services or program.