SQL Server has been working fine but since Friday I have not been able to connect to the database engine in SSMS. This coincided with my having to power the laptop off durin
Your error seems to have to do with the certificate you installed.
This article suggests changing the service the SQL server will log in as, you can do this at install, or via the surface configuration management tool.
http://social.msdn.microsoft.com/Forums/en-US/sqlsecurity/thread/56f14665-3f00-41ff-b002-bb5e86b3f219/