>My windows 11 is sick. I tested the code on Windows server 2016 and on an old windows 10 computer. Everything wen through practically smoothly. Perfect on WIndows Server 1016 but Slooooower on windows 10.
>
>So...
>
>8-< Now I'm wondering if there is a way to install a fix for that error without having to reinstall windows 11.
>
If your SSD is beefy enough I'd just add another OS.
Since Win7 it is not as much of a hassle as before -
as Win allows install into a vhd (vhdx in Win10/11),
so no need to futz with multiple partitions or multiple disks.

For safety reasons I still have 2 partitions (in case 1 gets nuked)
I have Hyper-V server 2019 and W11 23H2 on one,
W11 22H2 plus W10/64 and W10/32 on the other.

Create the VHDX as type=expandable maximum=120000;
those files stay here at 40 - 60GB each, easy to save/backup to external
with a batchfile doing some gymnastics moving dirs into special save dir,
calling robocopy with specific targets for each partition and my other directories.

One caveat: I have most of my programs as portable apps in extra directory,
so ~20 GB of programs are not in each vhdx, but external and common for all.
It is mostly MS programs (except vfp and Office 97) still in OS.vhdx\Programs or
OS.vhdx\Programs (X86).

Last step minimizes work when adding / testing new installs a lot
Create an USB boot stick with ventoy and many .ISO and the task gets easy -
and you are set to help others without a total OS wipe.

HTH

thomas