My sister in-law had a HP netbook with Vista installed. Can't remember the specific issue but one of the power settings caused it to use 100% cpu all the time (leading to a battery life of 10 minutes).
Resetting the defaults and selecting the max performance fixed the issue without needing a bios update. Changing any of the settings brought the issue back. HP is awesome like that...
But really the best fix for any issue with Vista is "Upgrade to Windows 7". Obnoxious, I know, but true.
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