Battery Draining Reported on Windows 7 Machines
Some owners of Windows 7 machines are complaining that the newest Microsoft operating system may be causing battery problems. Microsoft said it's investigating the issue.

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Will your new Windows 7 PC support XP Mode?
Last year, when I looked at Intel CPUs, I identified a potential sticking point for Windows 7 upgraders: many then-current CPU models didn't support hardware-assisted virtualization. A year later, has the situation improved? Yes, but with one noteworthy exception you'll have a hard time getting information from big PC makers....

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Windows 7 Tarnished by Notebook Battery Issues
Microsoft is investigating reports, dating back to June 2009, that users are experiencing drastically shorter battery life on notebooks using Windows 7.

Read more on PC World