Ctrl+Alt+Del Windows 7 Not Working

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Hi,

I have windows 7 installed on a computer and it is connected to a network.

When I log onto this computer with TeamViewer, if the computer is locked, the Ctrl+Alt+Del button (the running man) doesn't work and pressing Ctrl+Alt+Del on the Keyboard doesn't work.

Due to the computer being locked, you need to press Ctrl+Alt+Del to enter your username and password to unlock it.

Is there a way to do this?