It depends, somewhat, on what actually happens when you click on that link. What sort of window opens up, if any? When you say your computer gets locked, do you mean it goes to your own login screen/lock screen? Does it stop responding?
My guess... and this is just a guess... is that clicking on that link opens a modal dialog which needs to be closed before anything else can happen. The application does not return until the dialog is closed... if it doesn't return, TestComplete can't know what next to do.
This is considered an "Unexpected Window"... you may be able to handle it via the following instructions.
What happens when you try this test manually? Does it still lock up?
