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Editorial Team
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Asked: 2026-06-11T17:17:09+00:00

Programs like ScanDisk/chkdsk can run while Windows is booting, i.e. before the logon screen

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Programs like ScanDisk/chkdsk can run while Windows is booting, i.e. before the logon screen appears. I thought this was only for Windows internal programs, but I have seen that Avast! antivirus offers the same feature, to perform virus checks while Windows is not yet loaded. How is this accomplished? I.e. what kind of APIs do I have to use to write such a program? Can it be any kind of commandline program, am I restricted to a subset of the Windows API, do I have to implement a specific interface?

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1 Answer

  1. Editorial Team

    Look at registry key

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

    And value of BootExecute

    More info here :

    http://technet.microsoft.com/en-us/library/cc963230.aspx

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