How to manually uninstall packages

Sometimes uninstalling a package from Add/Remove Programs (ARP) fails because of an error in the package's setup program, or the package is gone from ARP, but there are indications it is still installed - for example, running setup to reinstall jumps straight to the maintenance mode.

Windows tracks all installed packages in the Registry, in HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall. Run regedit and go to that location. From that node search (menu: Edit|Find...) for the package (e.g., "Business Contact Manager"). For each one that you find, get the value of the UninstallString key (generally: "msiexec /X{...some GUID...}" or a Setup.exe command line) and run it.

That should remove the packages from the machine. After removing a package, refresh (F5) regedit.

If that doesn't remove everything, you can proceed to manually removing BCM files.