How to disable the Switch User in Windows Vista?

Windows Vista has its feature to Switch Users, if a computer is owned by a workgroup or has two or more users. I know for some it will be very useful, but for me, it’s not. I always unintentionally clicked the Switch User option, along with the shut down, sleep, log off and etc…
I am the only user on my own computer, so there is really no use to include this on my shut down option list. I want to know if I can disable it temporarily. I will just enable it again, when I need to. How can I possibly turn it off or remove it from the list?
Please help.
