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A This problem is most likely caused by software or drivers that aren't fully compatible with Windows 81. You'll have to use trial and error to find out which one is the culprit. Press Windows+R and type msconfig to launch System Configuration. Select the Services tab, tick 'Hide all Microsoft services' and clear the ticks against everything that remains. Apply the changes. Right-click the taskbar on the Desktop and select Task Manager. On the Startup tab, select each entry and click the Disable button. Now try restarting Windows without all the usual extras that load with it. If Windows starts normally, the problem must be with one of the items that was disabled. By enabling items individually and rebooting each time, you should discover the culprit. If it still won't start the first time, it is likely to be a driver. Go to the manufacturer's website of the video card, printer, webcam and anything else you have installed, and look for updated software.