When I go to turn my lap top off I go the icon at the bottom left hand corner and it should go to power options, when I would press 'shut down'. What is happening is a blue box comes up in the middle of the screen stating 'critical Error', will be sorted when laptop is shut down. This has been going on for the last the days and has not fixed itself. Also, since this has been happening I am unable to download any pdf files, which has not been a problem until now.
Any help would be greatly appreciated.