WINDOWS TIPS AND TRICK

1. Press the Start button in the lower-right corner of your screen, and navigate to the Accessories menu to find the entry for Command Prompt. Alternately, you can type 'cmd' in the Start menu's search bar, in more recent versions of Windows.
2. Right-click on the Command Prompt icon and select 'Run as administrator.' Enter your administrative password.
3. Look at the window that appears. This is Command Prompt---an important program you can think of as a sort of mini-DOS within Windows, or an expanded version of the Run dialog that allows you to see any text output a command gives you. You'll see your operating system's version information, followed by 'C:\Windows\system32>' and a blinking cursor.
4. Type 'sfc /scannow' and press Enter. This will run the System File Checker, a text-based program that will look through all your system files, DLLs included, and replace any that are missing or damaged. This will take some time, so feel free to do something else until the process finishes. File Checker will show you the percentage of the scan completed, and print a list of any integrity violations discovered and fixed.