Hi everyone, I have just joined especially because I can't find any information on the issue I'm having...and I'm hoping you guys maybe able to shed light, or have had a similar experience. I have a Macbook (mid 2007 refresh) with Vista installed through Bootcamp. Please don't look down on me though, I *need* Windows installed, though I use OS X the most obviously. The issue is that when Vista runs off the AC it works fine; and then the moment you turn off the power and leave it running on battery it becomes seriously unstable and jerky...rendering it virtually unusable. Has anybody had an experience like this with Windows on a Macbook? It affects XP as well. It has literally just started doing this now out of the blue; for over a year Vista (and XP) have both worked fine alongside OS X with no battery problems whatsoever (or any problems for that matter.) The issue doesn't affect OS X, only Windows (surprise, surprise.) You name it, I've tried it; updated drivers; re-installed drivers; used old drivers; quick format; 7 pass format; tried bootcamp 1.4, bootcamp 2...everything I've tried doesn't rectify this issue! Has anybody had anything like this? Any replies welcome. Thanks.