Server Name Change

Forgive my newbness, but I need help with a couple of scripts. Computer name changes happen alot where I work and I'm trying to make a simple batch file that when run, will automatically update the SQL server name. I believe this will work, but I am having problems with the text formatting of the output file. Here is the 'code':

-------------start of batch file------------------

CLS

REM THIS BATCH FILE WILL UPDATE THE INSTANCE NAME ON A SERVER, WHERE THE PC NAME HAS BEEN CHANGED AFTER THE INSTALLATION OF SQL

"%ProgramFiles%Microsoft SQL Server90ToolsBinnSQLCMD" -S "127.0.0.1" -U sa -P mySApassword -Q "select @@servername" -o C:OLDSERVERNAME.TXT"


"%ProgramFiles%Microsoft SQL Server90ToolsBinnSQLCMD" -S "127.0.0.1" -U sa -P mySApassword -Q EXEC sp_dropserver -i C:OLDSERVERNAME.TXT"


"%ProgramFiles%Microsoft SQL Server90ToolsBinnSQLCMD" -S "127.0.0.1" -U sa -P mySApassword -Q EXEC sp_addserver '127.0.0.1', 'local'"



REM NET STOP MSSQLSERVER

REM NET START MSSQLSERVER

PAUSE

-------------end of batch file------------------

I guess I could also edit the loopback address to be the current PC Name, but this should work for my purposes I also know that I may have to change the authentication mode from SQL to Windows Authentication.

Also, is there any way to enable Named Pipes and TCP/IP connections via script, without having to use SQL Configuration Manager?

Thanks.