SQL 2005 & 2012

We have a server with SQL 2005 on it.  We just installed SQL 2012.  When I look in the services there is also an instance called SQLEXPRESS.  When I go into the control panel to uninstall a program I do not see any SQL Express installed. 
I have stopped the SQL express instance and am trying to start the SQL 2005 and SQL 2012 instances at the same time.  We need the 2005 to be started to be able to look at the current system and 2012 needs to be started at the same time as we are
trying to redo the system in SQL 2012.  Does anyone know why we can not start both instances at once.  If one is running and I try and start the other instance I get "Windows could not start the SQL Server (MSSQL2012) on Local Computer. 
For more information, review the System Event log.  If this is a non-Microsoft service, contact the service vendory, and refer to service-specific error code 10048."  When I look in the System event log I see the following "The SQL Server
(MSSQL2012) service terminated with service-specific error Only one usage of each socket address (protocol/network addres/sport) is normally permitted."  Can anyone give me some information as to what the problem may be.  Thanks in advance.

I have previously tried stopping 2005 and 2012 and starting one before the other, while rebooting the server in between.  However, I always got the same error regardless of which SQL was started first.
Thanks for the information/link.  I stopped all SQL, started 2012, and then tried to start 2005 using the link you provided.
Most of it appears to be OK until I get near the end of the output and then I see the following errors:
(1) error:  26023, Severity: 16, State: 1
Server TCP provider failed to listen on [ 'any' <ipv6> 1433].  Tcp port is already in use.
(2) error: 17182, Severity: 16, State 1
TDSSNIClient initialization failed with error 0x2740, status code 0xa.
(3) error: 17182, Severity: 16, State: 1
TDSSNIClient initialization failed with error 0x2740, status code 0x1.
(4) error:  17826, Serverity: 18, State: 3
Could not start the network library because of an internal error in the network library.  To determine the cause, review the errors immediately preceding this one in the error log.
(5) error: 17120, Severity: 16, State 1
SQL Server could not spawn FRunCM thread.  Check the SQL Server error log and the Windows event logs for information about possible related problems.
In looked in the event logs I see the errors above and a warning (at the same time stamp) that says: "MSDTC encountered an erro (HR=0x80000171) while attempting to establish a secure connection with system".
In looking in the event log for SQL 2012 (since 2005 is not running) I do not see any errors.

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