OK. How about TPM?

Check BIOS settings for Secure Boot and Boot method - ie UEFI vs Legacy. No legacy boot for Win11.

Sine wave.

​

crappy USB drive.

ETHERNET!!

If you can afford a 10k sq ft house, you can afford to run CAT 6 everywhere.

Home plug. Ethernet over house wiring.

Remove your hard drive. Replace with new. Re-install Windows. Drives are cheap.

Not sure what you mean by “splitter”. You need a switch to plug in more than one device.

Also find out if your network port have been assigned to a single IP address.

super common repair. Try eBay:

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https://www.ebay.com/itm/183857459030?hash=item2acec22f56:g:gR4AAOSwAx9b-X-F&amdata=enc%3AAQAIAAAAwBe4N1YQqy2agI64EbtPRJzbnl6kCU%2BvssXDbyam2piqBFC6SfrMGiZVmBLg6hTVfcdrQUTtyyfuyBx1zA3OX3UsKJa5BDQhkNICq1e2SZ9VCEQi497VzR5NPdKau39QFXewW%2BsBLOd4%2FD8DfHe22VKKIQwc4Fv%2Fb0Ukok0evkJlqRq3ocIlDHOYHpq%2BpRrU9G6DFn7kKti2%2BfFIbQ%2FnQEbcrEHrXw%2BEwjFLa8EmbPeSGBl0jh2A3N%2B6NbQD7ASRXg%3D%3D|tkp%3ABk9SR5z264r\_Yg

Ethernet. Nothing beats wire.