Did that product key come with the disc when you got it? If so, the key should work unless you're typing something wrong when you enter the it. Be careful because it's easy to mix up 0 (zero) and O (letter o), B (letter b) and 8 (eight) and some other pairs. You might just be making the same typo each time. If this is a legitimate key for your product you might be able to get some help from Microsoft.
This page explains how to contact their activation site.
If your school supplied the disc as part of Microsoft's academic software program, you should have received a key. Check with the contact person at your school, usually your teacher or someone in the Information Technology department.
If you're trying to use a key for Office 2007 from some other source, you probably have a key meant for some other version then Enterprise. Keys only work on specific versions. If this is the case, you can only fix the trouble by using a legitimate key. Unfortunately, you can't get keys for Office 2007 from MS now because they want you to buy Office 2010. You may still be able to find copies locally or online.
You can also download and install
OpenOffice, a 100% free alternative office suite. Unless your school requires Microsoft Office because of some unique function, OpenOffice will give you the same features, and you don't need to worry about keys or activation.
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