Same thing here.  Win10, Qb2021 Premium

Thanks for all the effort everyone put into solving this.

I tried Jim7Mc's/amtrucken's solution reinstalling VC_redist.x64.exe 2015-2019 but still got the same thing.  All accounts in use are non-administrator accounts.  I kept doing everything using "Run as administrator".  Finally I logged into an administrator account and started QB there.  (Also temporarily disabled my AV and MS Ransomware Protection -- don't know if that was necessary, just standard practice.)  It worked!  So "Run as administrator" is not always sufficient for full administrator privileges for installs.  At least not with QB!  (First time I've ever seen "run as administrator" not work for installs that require administrator privilege.)  One more thing to add to the list of possible solutions!