If HService was configured to run as a system service under Windows NT, 2000 or XP, first make sure that the service is stopped.
After HService is stopped, uninstall the service by starting HService.exe for a last time with parameter /uninstall:
C:\Program Files\Hamster> HService /uninstall
If you have added HService or HControl to the Autostart folder, be sure to remove these entries again before deleting any Hamster files.
Just delete all the files or the complete folder and sub-folders, where Hamster was installed to and running in. There aren't any registry settings or additional files anywhere, that were created by Hamster.