You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
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.
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...
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