To put the entire SQL server into single user mode

This is for SQL2005, for SQL 2008, you will need to change the directory where the sqlservr.exe file is located.

Open Cluster Admin - stop SQL services

open cmd prompt and type (or copy/paste) the following:

cd "C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn"

sqlservr.exe /s SQL1 /c /m /T3608

- you will see a bunch of stuff fly by on the cmd window, this is normal

start SQL Management Studio

Click CANCEL! on the connection prompt

Click New Query - then select your database from the drop list (it's right under the New Query button)

Paste in your DB reindex t-SQL script in the query window and execute