This issue occurs because the Bootcat.cache file is corrupted or because the size of the Bootcat.cache file has changed since the last successful start.
Note The Bootcat.cache file is located at %SystemRoot%\system32\codeintegrity
(The %SystemRoot% folder is where Windows is installed. This is usually C:\Windows .)
To work around this issue, start the computer from the disc drive or from a USB drive by using Windows installation media. Delete the Bootcat.cache file, and then restart the computer.
Bart PE or a linux live disk (with ntfs support) will also work.....
could also be a dodgy ram stick, try running memtest.
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