Customizations and Registry Tweaks Persisting After Clean Windows 11 Pro Installation on Wiped M.2 Drive


Greybeard70

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I recently had to perform a completely clean installation of Windows 11 Pro after my previous installation (version 25H2) became corrupted due to defective memory.

Steps Taken for Clean Install:
  • Used Rufus with a fresh Microsoft ISO.
  • Opted out of installing any AI options.
  • Created a local logon (which is the only type of account I use).
  • Deleted all original partitions during setup and chose to install on the unallocated space of my M.2 drive.

Problem:
As expected, I had to reinstall my programs. However, I ran into a very strange issue: when I went to manually disable services I don't need and apply my usual registry tweaks, I found that the services were already disabled and the registry changes were already present—exactly as I had configured them in my previous, corrupted installation.

Questions:
How is it possible for customizations from a previous installation to persist across a clean install on a wiped drive?
 

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