How many computers can I install Windows 7 Professional?

Office 2007 licensesYou get 3 licenses with the retail version of Office 2007 Home & Student.

Other retail copies allow you to install on up to two computers, provided at least one is a laptop/netbook. Both computers must also be used by the same person. It may be possible to install on two desktops, or on a friends computer, but this would be a violation of the End User License Agreement (EULA). Microsoft has the right to deactivate one or both installs if you violate the EULA.