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0x8007025d

Windows setup could not copy its files. The USB stick, the download or the RAM is usually at fault.

How to fix it

1. Make the install USB again with the Media Creation Tool, preferably on a different USB stick.
2. Use a USB 2.0 port or a different port.
3. Unplug other drives during setup.
4. If it still fails, test the RAM with MemTest86.

Is it serious?

Usually a bad USB stick. Try another one first.