Downgrade all the way. I'm a small business IT consultant and picked up a lenovo laptop with Vista and really tried to learn it and like it. But the extra infuriating "security" measures built into this OS and it's lack of stability (Explorer began to frequently crash after 2 months - with only MS office loaded) I figured that if I have to take to time to reload, I might as well load XP. Runs faster and hasn't crashed since.
I'm praying Windows 7 is more like XP than Vista. And my clients running proprietary apps would be thankful as well.