Windows 7 (Professional)
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Full user review
"UBUNTU and Mac have both made strides too."
Big improvement over Vista if you don't mind spending the $400+ for the Professional/Enterprise version.
No good OEM OS. If you think the OEM Home edition will give you the experience you get in Pro or Enterprise, you're wrong. Low end versions are worse than Vista and laggy.
Microsoft needs to get used to the fact nobody wants to pay $400 for a PC and then another $400 for the OS anymore...just to spend more money on the actual software. The business model needs to change or they need to go away.