How to Repair Defective or Missing System Files in Windows

Step-by-Step Guide

1. 1

   Step 1: Open the Start menu.

   Click the Start button.
2. 2

   Step 2: Search for Command Prompt.

   Type cmd.exe.
   
   Users of Windows XP must click All Programs then the Accessories subcategory. , Right click cmd.exe to open the context menu and click Run as administrator.
   
   Users of Windows XP must hold the ⇧ Shift key while right clicking Command Prompt, click Run As to open a dialog window, select the The following user radio button, type Administrator as the user name and the password of the account (usually blank), and click OK.
   
   Click Yes on the User Account Control dialog if it appears. , In Command Prompt, type sfc /scannow and press the ↵ Enter key on your keyboard. ,,, In Command Prompt, type sfc /scannow and press the ↵ Enter key on your keyboard. ,,, Click the Start button. , Type cmd.exe.
   
   Users of Windows XP must click All Programs then the Accessories subcategory. , Right click cmd.exe to open the context menu and click Run as administrator.
   
   Users of Windows XP must hold the ⇧ Shift key while right clicking Command Prompt, click Run As to open a dialog window, select the The following user radio button, type Administrator as the user name and the password of the account (usually blank), and click OK.
   
   Click Yes on the User Account Control dialog if it appears. , Type net start "trustedinstaller" into Command Prompt and press ↵ Enter. , Type net start "windows modules installer" into Command Prompt and press ↵ Enter. ,
3. 3

   Step 3: Start Command Prompt as an administrator.

4. 4

   Step 4: Start System File Checker.

5. 5

   Step 5: Wait until System File Checker finishes checking and fixing your system.

6. 6

   Step 6: Start Windows in Safe Mode with Command Prompt.

7. 7

   Step 7: Start System File Checker.

8. 8

   Step 8: Wait until System File Checker finishes checking and fixing your system.

9. 9

   Step 9: Shut down your computer by typing shutdown -t 0:00 into Command Prompt and pressing the ↵ Enter key on your keyboard.

10. 10

    Step 10: Open the Start menu.

11. 11

    Step 11: Search for Command Prompt.

12. 12

    Step 12: Start Command Prompt as an administrator.

13. 13

    Step 13: Start the Trusted Installer service.

14. 14

    Step 14: Start the Windows Modules Installer service.

15. 15

    Step 15: Follow the Steps of Part 1.

Detailed Guide

About the Author