Systems may require upgraded and/or separately purchased hardware to take full advantage of Windows 7 functionality. Not all features are available in all editions of Windows 7.
See http://www.microsoft.com/windows/windows-7/ for details.

*Not all Windows 8 features may be available on all Windows 7 PCs. Your system may require additional hardware, software, firmware, and/or a BIOS upgrade to install and run Windows 8. For complete upgrade details, see www.windowsupgradeoffer.com/en-US and www.windowsupgradeoffer.com/en-US/Home/Faq.
Check these sites frequently, as some details may change and/or additional information may become available.