MS Office 2007 Standard Problem

[Swordmaster]

Okay, so since I don't have the regular Microsoft Office, I have to download trials every 60 days (or so) from the website. About two weeks ago I installed a new one, but today I found it locked. I went to uninsall it, but everytime I try, this comes up:

Setup cannot continue because a required file is either corruped or unavailable. Run setup again from the original source disc or download location.

And for the record, I'm only fifteen and jobless, so that explains why I can't buy one. Or I'm a cheap bastard. Either way, I would welcome any help one could give.