https://www.theregister.com/ has a series of articles on what's going on technically.
Latest advice...
There is a faulty channel file, so not quite an update. There is a workaround...
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Boot Windows into Safe Mode or WRE.
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Go to C:\Windows\System32\drivers\CrowdStrike
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Locate and delete file matching "C-00000291*.sys"
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Boot normally.