If you want to uninstall an appliction that has no uninstall program and it is not listed in the Add/Remove applet of Control Panel (or that uninstall doesn't work), then just delete the directory/files. Drill down:
HKEY_LOCAL_MACHINE\SOFTWARE\ and HKEY_CURRENT_USER\SOFTWARE
locating the applications entry and delete them.
Use Explorer to to remove the entries from the Start Menu in either %windir%\Profiles\All Users\Start Menu\Programs\ and/or %windir%\Profiles\YourId\Start Menu\Programs\
If there is an entry in the Add/Remove list, edit:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
locate the entry and delete it. If the app has a service, edit:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services
and scroll down till you locate it. Then delete it.
If this app starts automatically and there is no entry in the StartUp folder(s), then use Regedt32 to edit:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
load REG_SZ and
run REG_SZ
Remove the offending value and reboot.
