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When trying to uninstall (Settings >> Apps & Features >> Miktex 2.9 >> Uninstall) a regular Miktex 2.9 installation (user installation, not administrator) on Windows 10, I encounter the following error:

MiKTeX
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Administrative startup refused because this is not a shared MiKTeX setup.
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OK

Miktex itself is broken (some .exe files are missing, the updating process in Miktex Console fails with an error, execution of pdflatex doesn't work, etc.), so I'd like to completely uninstall it and do a fresh new installation. Any help is appreciated.

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    Note that MIkTeX might not be broken: The Package Manager has been removed and replaced by 'MikTeX Console' (see github.com/MiKTeX/miktex/issues/86). But at least on my installation the start menu links for the Package Manager remained leaving the impression of a broken installation. – moewe Mar 6 '18 at 22:57
  • If nothing else works, try brute force: Manually delete the MikTeX program folder, and anything involving MikTeX in your ProgramData and User AppData (hidden) folders. Then use a registry cleaner (such as CCleaner) to get rid of dead registry entries. Then reinstall. I recommend a portable installation: Never given me trouble, and I can occasionally make a zip archive of the whole thing. – user139954 Mar 7 '18 at 0:11
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    Thanks for your comments, I added the necessary information in my question. Its a user installation, to uninstall I just used control panel. Not sure if that's a user or administrator uninstallation, but from the error message I'd guess that control panel tries administrator uninstall. How to change that behaviour? – Lennart Mar 7 '18 at 9:47
  • I'm aware of the change to Miktex Console, but that also doesn't function well. On the first page, it tells me that the PATH is not set correctly (although it is, I can call "latex" or "pdflatex" from any folder). Moreover, the displayed installation path mixes both unix and windows path notations (backslash \ and slash / for folders), so I think that may be a problem. Moreover, some exe files are missing in the installation folder, leading to a crash of the Miktex Console package updating process. – Lennart Mar 7 '18 at 9:49
  • Maybe tex.stackexchange.com/q/231131/35864 helps. If you didn't install as admin you probably want uninstall.exe and not uninstall_admin.exe. BTW: My MikTeX has mixed slashes and that is not a problem at all C:\Program Files\MiKTeX 2.9\miktex/bin/x64 works just fine. – moewe Mar 8 '18 at 13:39
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Deleting any tex-related files manually from my computer and running a registry cleaner (such as CCleaner) before re-installing Miktex 2.9 solved the issue. Use the Windows search to find all files, they might be distributed in the entire system: C:\Program Files, C:\Users\User\AppData\Roaming, C:\Users\User\AppData\Local, etc.

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