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There is an app. If i open up a specific file with it, Windows 7 actually locks up. I can't Ctrl+Alt+Del and I could only move my mouse. Nothing is clickable. Nothing can be done. It reminds me of the Windows 98 days.

I don't suppose I can find out why it happens? Maybe someone already knows a way or two that causes Windows 7 to lock up?

As a programmer I am interested in how this could happen.

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Check the event log for clues (start -> eventvwr.msc)

The behavior you're experiencing is likely due to Windows being stuck in a driver or some other kernel facility. Windows implements things like network drives and the GUI as kernel code, so for example, if you are accessing a network drive and there are issues with the connection this kind of thing could happen.

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