System File Checker

A Windows tool worth digging for

SFC is an invaluable tool in Windows. It checks that all Windows files are where they should be and that they’re uncorrupted, it then puts things right. If you’ve done all your virus checking, error checking and defragging, but Windows is still doing strange things, then SFC can be your saviour.

SFC in Windows XP

In XP it was thought by many to be extinct. Not so, for some inexplicable reason, Microsoft changed the default command:

  1. Click Start,
  2. Click Run,
  3. Type sfc /scannow,
  4. Then click OK and follow the instructions.

Starting with Vista they made it even more obtuse. You need to open a Command Window in Administrator mode:

SFC in Windows 7 and Vista

run-as-admin

  1. Click Start,
  2. Click All Programs, then Accessories,
  3. Right click on the Command Prompt option,
  4. On the drop down menu which appears, click on the “Run as Administrator” option.
  5. If you haven?t disabled User Account Control (and you shouldn’t!) you will be asked for authorisation. Click the Continue button if you are the administrator or insert the administrator password.
  6. In the Command Prompt window, type: sfc /scannow,
  7. press Enter.

You’ll see the system scan will begin. The scan may take some time and Windows will repair/replace any corrupt or missing files. You will be asked to insert your Vista DVD if it’s needed. Close the Command Prompt Window when the job is finished.

One caveat:

You may need a Windows CD or DVD to enable SFC to make repairs. Try not to get suckered into buying any Windows computer with just a Recovery or Restoration disc, if you can’t avoid it, copy, or borrow somebody else’s disc or download a Windows ISO file from the Internet and create your own disc. If System File Checker can’t fix it, the next step is a repair installation or if your system’s really messed up, a clean install from scratch. More on these coming soon.