Deep Insights in Microsoft .NET

This could be a disk corruption issue because you hard powered it off. This happens when you have an old OS like Windows 7 without SP1 and it is slow to begin with. Run chkdsk and all should be ok after that.

This is a bad issue to have and I have Windows 8.1 and nothing worked but this: " Bring the troubled window to focus by clicking on it in the taskbar (or Alt+Tab). Now you can simply  hold the Windows key on your keyboard  and tap the arrow keys. With any luck, your missing window will snap back into view. " http://www.techspot.com/guides/226-bring-lost-window-back-desktop/