I didn't think it was bios either but can't see what else changed.
I'm using windows 7 RC 1 and been my primary for two months and windows XP is also installed. Task manager doesn't help much. It's high for whatever I am doing at the moment. If I'm holding the left button on the mouse and dragging it around fast, iexplore spikes to about 30-40% usage. When I open chrome it goes to 30-50%. I can't multi-task very well anymore. Booting is still fast, even when loading windows.