I need help for windows 7 key?


I have seen some auctions on Ebay selling Windows 7 keys Windows 7 Activation Key. I purchased a single-license Windows 7 Home Premium for my laptop a few months ago, and I want to install Windows 7 on the new desktop computer I’ve built. Are Microsoft Office 2007 Professional Plus these numbers that are being sold legitimate and usable with my copy of Windows 7 Cheap Office 2010? Or am I stuck buying the same software a second time?