try it on the command prompt
Run openoffice from a command prompt and see if it gives you an error message. It's probably called "ooffice" or "soffice". You can use K Menu→System→Terminal Program (Konsole) for the command prompt. Launch konsole, type "ooffice" and press "Enter". If that says "command not found" try again with "soffice" instead. Let us know what error message you get, if any.