Hi, Fokke.
The System File Checker, as its name suggests, checks system files. It
was/is a part of Windows XP and later versions of Windows; I don't
recall if it existed in Win9x or Win2K. For an official - but brief -
description, see:
http://support.microsoft.com/kb/929833
Use the System File Checker tool to troubleshoot missing or corrupted
system files on Windows Vista or on Windows 7
An unofficial but more complete description is here:
http://www.updatexp.com/scannow-sfc.html
The short answer is, "The System File Checker tool (SFC.exe) scans for
missing or corrupted system files and repairs them." For what I call a
"mini-Help" screen for its usage, open a Command Prompt window and type:
sfc /?
The most common use of the command is with sfc /scannow. This will scan
all the installed operating system files in your Windows installation
and compare them to a "known good" copy of the file kept in its on-disk
cache. If it cannot find the good copy on your disk, it may ask for you
to insert the DVD, but this is not usually necessary. If a required
file is missing, it will replace it; if the file is corrupted (and fails
the CRC or other test), SFC will replace it from the cache. This might
take some time...
SFC is a seldom-needed tool that is a life-saver in the rare times when
we do need it.
RC
--
R. C. White, CPA
San Marcos, TX
(e-mail address removed)
Microsoft Windows MVP (2002-2010)
Windows Live Mail 2012 (Build 16.4.3503.0728)) in Win8 (RTM Ent Eval)