If you notice closely, there exists a amount of color throughout Windows experience. The default is defined to blue. If you want to put it back, use Colors section. Here you'll be able to select the free standard colors or make use of the color picker. The color will probably be used everywhere including Start, Taskbar, Action Center, etc. There are situations in which you should perform the System Restore operation. But occasionally you could possibly face a mistake ' To use System Restore you need to specify which Windows installation to bring back. This error is caused on account of corrupted files inside system which pops up this error https://wikidll.com/microsoft/d3dcompiler_43-dll.