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IBM laptop ThinkPad R40 on board left-mouse button do not work

Last Modified: 2013-12-09
I have a IBM laptop ThinkPad R40 laptop, the on-board left-mouse button does not work. I have done this action:
Control Panel -> Mouse -> UltraNav -> Enable TouchPad -> Settings -> Button -> Left Button Action -> Jump tp the Start Button -> OK
Then the left button is working. But when boot computer, on the login screen, the left button still does not work. After user logon, it is working.

How do I set to make the left-button work on the login screen?  
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