Going to need a LOT more information.
What error messages do you get?
Are you installing from the original disc or a legally downloaded version?
Is the disc scratched?
Is the download corrupt?
Do any of the other Office programs install correctly?
What is the meaning of life?
Does it fail while installing, before starting to install or after the install said it was finished?
Have you run a virus scanner and a malware program? Microsoft Security Essentials and malwarebytes are your two best friends.








