USE [master]

GO

EXEC xp_instance_regwrite

N'HKEY_LOCAL_MACHINE',

N'Software\Microsoft\MSSQLServer\MSSQLServer',

N'DefaultData',

REG_SZ,

N'C:\ new data file path...'

GO

EXEC xp_instance_regwrite

N'HKEY_LOCAL_MACHINE',

N'Software\Microsoft\MSSQLServer\MSSQLServer',

N'DefaultLog',

REG_SZ,

N'C:\ new log file path...'

GO

EXEC xp_instance_regwrite

N'HKEY_LOCAL_MACHINE',

N'Software\Microsoft\MSSQLServer\MSSQLServer',

N'BackupDirectory',

REG_SZ,

N'C:\ new backup path...'

GO