I got the above problem, Well as a daily routine I switched on my PC, opened VS 2010, MS SQL Server. Build the solution and run it. I got this.
I googled it and i got these many solutions.
I tried to find the running process there are ain't one as i got the error when i run the application after i switched on my PC.
Every day it was working fine. Why not today?
I think i dont need to worry about firewall/antivirus. What may be the problem?