Why in my PC windows 8 gadgets are not working?

Windows gadgets are awesome tools that give you vital info regarding functioning of your computer but sometime it happens that some of windows gadgets may stop working and may not display properly, and may appear as black squares, vertical green lines down the center or may not appear at all and may have a blue exclamation mark next to it. And this problem exists even if you have tried system restore, UAC or CMD scan now. In order to function it once again you have to right click on My Computer and select Properties after that go and select System Protection then click system restore in the new dialog box that appeared after clicking system restore now perform system restore after this your system will restart and when the window appears then click on the start screen gadgets and gadgets will start working for you.