How do I put windows 7 and xp both on my laptop?
 

I am not that computer Windows 7 Enterprise Key savvy, so I do not know Windows 7 Pro much. I was just wondering what Office 2007 Serial is and how it is better than Office Professional 2007. I managed to download a tool from Microsoft and it said that my computer was compatible for Windows 7. Now, how do I go about getting Office 2010 Pro Plus Key? Is it free to download or do I have to buy it? If so, how much does Office 2010 Pro Plus Key cost?