PROCESS1_INITIALIZATION_FAILED (Windows 11 Upgrade 10.0.22000.120) after reboot.

I'm on .120 and haven't had any problems except Windows Sandbox not working, and that's a known and reported issue going back too .100. Otherwise .120 has been fine for me. Some people are having issues with it though, others aren't. I'm in DEV and haven't had any issues with any of the builds, and I'm on an old computer on one of my computers. There can be many reasons for your issues. Your computer doesn't meet the minimum requirements so it's not able to properly run Windows 11 or as the builds add more features and abilities your computer might be having problems handing it. Your PC barley meets the minimum requirements and is still struggling with Windows 11. There's hardware or software issues interfering that is causing the issues you mentioned. There could be a glitch in this build version where some PC's aren't able to handle it.  You can revert back to Windows 10 and wait into a more stable version of Windows 11 in Beta Channel is released or wait into the stable released version of Windows 11 is released. You can system restore back to .100 if you were on it, and if it allows you (not grayed out), put yourself into the Release Preview Channel which will stop Beta builds for awhile and try Beta Channel again when a new release comes out.