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I remember there was a phrase we type in 'Run box'/ command-line and insert windows CD in drive, then it scans whole system for probable errors and fix them. Would you please say it?

Or Any new similar concept maybe exists.

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    There was sfc /scannow, but it does not check for "probable errors", only for corrupted system files (which is somewhat rare).
    – u1686_grawity
    Sep 28, 2011 at 12:59
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    SFC checks for corrupted, missing or the wrong versions of system files, its a pretty comprehensive scan.
    – Moab
    Sep 28, 2011 at 14:43
  • Thanks. Is there any command to scan registry too? also where is the reference for these commands?
    – DummyBeginner
    Sep 28, 2011 at 14:47
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    The registry is somewhat like a journalled filesystem: the hives don't get corrupted; if they do, they are repaired automatically. The data, however, cannot be checked since Windows doesn't know what is "correct" and what is "wrong".
    – u1686_grawity
    Sep 28, 2011 at 15:15
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    @1Geeky: Keep in mind that data and internal structure are two separate things -- just like files on a filesystem. The filesystem structure can be repaired automatically, but if the data is corrupt only its creator can know it... If you have a folder full of music, it won't slow the computer down just by being there, and neither will a registry key... There are some cases when "registry cleaners" can be useful (e.g. stale pointers to old DLLs) but they very rarely fix actual issues, at least from my own experience.
    – u1686_grawity
    Sep 28, 2011 at 20:07

1 Answer 1

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You might be thinking of System File Checker

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SFC in XP

Vista and W7

SFC in XP can be problematic since it uses an installation CD to source its files if they are needed, and these may be the incorrect versions since windows updates can change system file versions, you should at least use a XP install disc that is the same Service Pack version as the XP system you are running SFC on.

Vista and W7 does not suffer from this problem, it sources the files from your current installation cache of files.

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