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Windows 8 Upgrade ($40)
Microsoft's Windows 8 Professional operating system can give a big boost in performance to your aging PC running on Windows 7, Windows Vista or even Windows XP. At $40, this is the cheapest Windows OS upgrade in history, and is packed with a multitude of new features, including integrated antivirus and antimalware, superior power managment, lower memory resource utilization, support for SSD drives, faster boot time and improved networking and video performance.
For a list of new features and performance improvements in the new version of Microsoft Windows, check out Jason Perlow's article.