Microsoft Office - Microsoft Natural MultimediaKeyboard

i have windows XP home edition service pack 3. and i use Microsoft office 2003, and well recently it began to pop up and say microsoft office word has not been installed for current user. please run setup utility. Well i only have one user, never had another user created until recently (temporary fix) is there anything i can do, the main user is called the owner, it says its the computer admin, but i guess there is still an admin user, i cant get to that. the only way i can get ms office to work was to create a new user, open all the office programs, export the office registry, and import it to my main user, thats the only thing that works, for a little bit.