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Logged into an admin account, I am running a virus scan.

When I lock the machine, it allows other users to "Switch User" and log in. Is there a way I can temporarily prevent other users from loggin in?

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If you turn off fast user switching you can do this, but that requires a bit of registry editing in Vista. You used to be able in XP to disable it via the control panel but no longer in Vista. Check this thread

Once that's done, you can Lock the computer and not have the switch user screen come up.

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I don't have Vista in front of me, but I believe if you check Services, there is a service named "Fast User Switching" . . Disable and stop this service and you should be good.

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