Ppi is the number of pixel per inch, so it's better to have 1200 than 600 pixel per inch for a better print...
Sorry! dpi is the dote par inch, the number of ink bubble per inch. Tell me more about your problem, perhaps I will help you with my broken english.....
Ok .... you are Online... have you MSN messenger adress? Mine is dmmjulien@msn.com. Do you use good quality paper? personaly I use record card and a canon i550 inkjet printer...