Windows 7 Release Candidate .
The Windows 7 Release Candidate, can be used on personal PCs and notebooks, until March 1, 2010..
Windows 7 Enterprise .
If you've recently in…stalled the Windows 7 Enterprise on your personal PC or your personal notebook, you can use the Windows 7 Enterprise, for 90 days. The reason why, is because the three full versions of Microsoft Windows 7 will be available at all electronic stores, and mega-stores such as, Walmart, Target, Meijer (stores only available in the Midwest), starting on October 22, 2009. ( Full Answer )