Remove the program from the registry.

Sometimes we install applications in Windows Program Unable to uninstall because of an error. We need to manually delete it. What should we do? In this case, we should first Delete the registration information of the application from the Registry, and then manually delete the installation folder of the application from the resource manager. So where is the registry key? Many people may know that it is HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall.
However, after we view all the registry entries in HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall, however, it seems that the applications in the "add and delete programs" list in the control panel are not all displayed here. For example, the corresponding registry items cannot be found in the commonly used office series. What's going on?
Originally, in addition to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall, there are two other registry keys used to save the information of registered applications, they are hkey_classes_root \ Installer \ products and HKEY_CURRENT_USER \ Software \ Microsoft \ Installer \ products. If we add all the applications defined by these three registry entries, we will see all the programs in the "add and delete programs" list.
Hkey_classes_root \ Installer \ products and HKEY_CURRENT_USER \ Software \ Microsoft \ Installer \ products are mainly used to save applications installed based on Windows Installer, such as office; HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall is mainly used to save applications based on other installation programs, such as common applications installed based on InstallShield. Therefore, if you need to manually delete the application software, if the corresponding registry key cannot be found in HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall, check hkey_classes_root \ Installer \ products and HKEY_CURRENT_USER \ Software \ Microsoft \ Installer \ products.