Go to a store. Buy the Office package. Go home, install it.
If you can't afford Office, please look at using Open Office from http://www.openoffice.org
As to pirated Office, the issues run deep here. Microsoft has laid many traps, which you have now discovered.
I have downloaded Microsoft Office 2003 standard edition. My trial runs out very soon & I entered a key code given to me by a friend (stupid I know).
The code did not work & I am now limited to opening office 50 times or so before it becomes useless.
I would like to upgrade to the full version & I of course am willing to pay.
The question is how do I do this & can I upgrade from a website or do I have to buy the package off the shelf & install?
If I re-install the software will I lose all of my items (emails) in Outlook & my folders?