Cannot input in Labview

until yesterday the program was fine, but nothing changed and I can not interact with Labview (version 8). Ctrl-E would not switch to diagram, string ctrl or number ctrl would not take anything. I move my mouse onto the ctrl and click, the screen just blink once, and would not allow me to do any change.
The only thing still works is button and if number ctrl has small arrow aside, I can change number by clicking arrow.
What a strange problem, I already reinstall Labview once, and I still have the same problem. Anyone know what is going on?

I have Labview 8.0, 7.1 and 7.0 installed on my pc previously. I tried all three version with blank vi, and they all have the same problem. I can not change to block diagram with top menus because I click on top menu, the menu just blink once, then disappear. The only things works is the ctrl button and small arrow besides number ctrl
I uninstalled all 3 version together with all the drivers (total 188 items) yesterday before I left work, and reinstalled Labview 8 this morning, it still has the same problem. 
I am giving up on this, unless you have some solution. 

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