Want to restore master database ....?

Hi i want ot restore master database .

FOr that i try to start my instance in single user mode....

But give below error:

C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn>sqlservr.exe - m -s TST_01 2009-03-18 13:17:35.18 Server Authentication mode is WINDOWS-ONLY. 2009-03-18 13:17:35.18 Server Error: 17112, Severity: 16, State: 1. 2009-03-18 13:17:35.18 Server An invalid startup option was supplied, either from the registry or the command promp t. Correct or remove the option. Please help me.....

From stackoverflow

• Maybe it's just a typo in your message, but in the command you wrote there's a blank between the first hyphen and the letter "m". You wrote - m instead of -m.