Using Regedit open the key below. Under this key will be a number of sub-keys, each representing an installed application.
To see which application each sub-key represents, open it and there should be at least two values 'DisplayName' and 'UninstallString'. 'DisplayName' is the name used in the Add/Remove programs list, and 'UninstallString' is the program used to uninstall the application.
To remove a program from the list you can simple delete the sub-key representing that program.
Key:[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall]
