Venkatesh,
Download UninstallView and run it. Find the orphaned entry, right-click on it and choose "Uninstall..."
If you get an error, the program may have been removed already. To delete the orphaned entry, right-click and select "Open Uninstall Item in RegEdit."
Export the registry key to a REG file.
Delete the key.
Alternately, try Revo Uninstaller.