touchscreen area malfunction

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hi,
leaving aside the dead or blocked pixels, I encountered an issue with my HTC TC WM6.1 touchscreen in the X (close button) area only - I know it still works, because the X flashes when I use the finger or the pen, it activates the phone and it even triggers a vibration response (when activated) but it no longer functions properly, as it doesn't close the programs anymore (don't think that the Close function is disabled, because it doesn't have the OK function either) and the window remains active on the screen.
It happened gradually, but al the neighboring areas assigned to other apps work just fine.
It's true, I spent some time tweaking, but I was carefull when modifying.
Have you experienced something similar? Can it be undone

thank you.

Assuming you got any backup, restore last registry backup(touchscreen keys only)