You will need
  • computer;
  • - administrator rights.
Click "start" in the corner of the screen in the line item "Run", type cmd, and press enter on the keyboard. Open a command prompt window. It will appear on a black background, so I do not think that this is another system error.
Enter the command sfc /scannow and hit enter. Will launch a system utility Sfc.exe which is designed to analyze the system files. This program scans all the protected files and when it detects unauthorized changes replaces the corrupted file with a healthy copy, taken from a special region of the cache folder.
Computer operating system designed in such a way that in many cases it is possible to recover deleted information, restore the system to an earlier working periods, do the backup, therefore, if you encounter any problems, do not panic. If for some reason the system cache is corrupted (it's located at "%SystemRoot%system32dllcache"), enter into the command line of another command sfc /Purgecache. This command will clear the cache and will proceed to immediate verification.
If you don't want to do this test right now, you can set it to run at the next system startup use the command Sfc /Scanonce. At every boot of the computer utility will work if you type Sfc /you run. After the work of the utilities you'll need to restart the computer. Follow this procedure at least once in a month or two, and your operating system will work long and smoothly.
in the future, try at least store backups of all information stored on local disks of your computer as the situation may be quite different.