I've just installed SQL Server Express 2012 on my Windows 7 machine. When I go to the Configuration Manager it allows me to enable/disable the TCP/IP protocol, but when I try to change any of the IP settings, on pressing 'OK' or 'Apply', it's displaying a dialog that says:
The specified file is read only. [0x80071779]
Update: The issue seemed to resolve itself. What's the inverse of Murphy's Law?
I have the same issue with installing sql 2012 Developer on W7 x64 Pro.
I have solved this huge issue by modify manually the Registry database in :
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL11.SQL2012\MSSQLServer\SuperSocketNetLib\Tcp]
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