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0xc0000225

Windows cannot find or read a file it needs to start, usually the boot configuration (BCD).

How to fix it

1. Make a Windows install USB on another PC with Microsoft's Media Creation Tool.
2. Boot from it (see the BIOS key page for your boot menu key) and choose Repair your computer > Troubleshoot > Startup Repair.
3. If that fails, open Command Prompt there and run: bootrec /scanos, then bootrec /rebuildbcd (on UEFI PCs, bcdboot C:\Windows is often more reliable).

Is it serious?

Fixable without losing files in most cases.