This can also occur if you twiddled with security settings.
I keep getting this message popping up on my screen;
Your system is low on virtual memory. To ensure that Windows runs properly increase the size of your virtual memory paging file. For more information, see help. Also internet explorer is sluggish. I have a Dell Optiplex G240 1.8 gig processor and 768mb ram. HELP
Help, my PC with Windows 10 won't shut down properly
Since upgrading to Windows 10 my computer won't shut down properly. I use the menu button shutdown and the screen goes blank, but the system does not fully shut down. The only way to get it to shut down is to hold the physical power button down till it shuts down. Any suggestions?