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The full removal process of the Axxon PSIM software in the following way:
Remove the Axxon PSIM software.
The full article: Removing Axxon PSIM™ software
If necessary, remove the registry keys from the registry section HKEY_LOCAL_MACHINE\SOFTWARE\AxxonSoft\Axxon PSIM\ for 32-bit systems (or HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\AxxonSoft\Axxon PSIM for 64-bit systems)
Important!
If any registry keys in this registry section or its subsections were manually created or modified, the custom values cannot be restored after deletion. If uninstallation is performed for the subsequent installation of a new Axxon PSIM version, this step is not recommended.