I need help with Microsoft Office home and student 2007?

I need help with Microsoft Office home and student 2007?

I purchased a CD of Microsoft Office Home and Student and when it says to enter the 25 character product key, I enter the one on the paper. But it tells me that it is incorrect. Can someone tell me why when that product key has to be correct? I went to Microsoft Office.com and they told me that i could be getting that message because something is "corrupted" in my computer

I need help with Microsoft Office home and student 2007?adware remover

Check it with your dealer.

I need help with Microsoft Office home and student 2007?antivirus protection

If its illegal you know why if it isn't just return it to the store and get a new one.