lock computer

From: "yawnmoth" <terra1024@xxxxxxxxx>
Date: 31 Aug 2006 10:36:08 -0700

According to (http://support.microsoft.com/?kbid=294317), "if the
Welcome screen is disabled, you can lock the computer if you press
CTRL+ALT+DELETE, and then click Lock Computer in the Windows Security
dialog box."

When I press CTRL+ALT+DELETE and bring up the task manager, I don't see
any "Windows Security dialog box"...

Any ideas as to what I'm doing wrong?

.

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