We do not accept any responsibility for events which may occur in you free choice to exercise these suggestions. These items are directed toward IBM compatable systems. When 'click' is referenced, this mean single click the left button on your mouse.
Systems lock for various reasons.
One common instance is over-extending your system memory. If you have multiple programs open, which exceeds your RAM availability, your system may lock. If you try opening programs simultaniously, your system may lock. A message prompting you to wait or end task will appear. Hopefully, this will 'kill' the locked program and your system will be available for use.