Upd: Русская версия статьи: Проверка целостности системных файлов Windows 7.

1. Click Start.

2. At the command prompt type: cmd.

3. In the results list find cmd.exe and right click on it.

4. In the popped up menu select Run as administrator.

5. Type sfc /scannow in the console window and then press Enter.

6. The process of system scan is starting.

7. Wait until it is completed.