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knowndll

About this tag
The knowndll tag on WindowsForum.com covers issues related to the KnownDLLs registry key, which is a critical Windows component that manages system DLLs. A common problem discussed is the Blue Screen of Death (BSOD) with error STOP: c000021a, indicating a knownDLL verification failure, often triggered by Windows Updates. Users report boot loops and repair mode failures, with troubleshooting attempts including chkdsk and sfc /scannow. The tag focuses on resolving these fatal system errors through recovery tools and registry fixes.
  1. F

    Windows 7 Blue Screen of Death with error message after latest Windows Update

    Help! After the latest updates on Windows Update I can't boot my laptop (an HP Envy Ultrabook 4). Every time I try to start the computer it first goes into repair mode (where none of the solutions have worked so far) and subsequently displays only a blue screen with the message: "STOP...
    • Fredrik
    • Thread
    • blue screen boot issues chkdsk error message fatal error help hp envy knowndll manual restart registry repair mode sfc status error support system crash system processes troubleshooting ultrabook windows error windows update
    • Replies: 3
    • Forum: Windows Help and Support
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