Joel Spolsky: Stay with Windows XP
This is no Microsoft-Basher talking:
I’ve been using Vista on my home laptop since it shipped, and can say with some conviction that nobody should be using it as their primary operating system – it simply has no redeeming merits to overcome the compatibility headaches it causes. Whenever anyone asks, my advice is to stay with Windows XP (and to purchase new systems with XP preinstalled).
Joel Spolsky was a Program Manager on the Microsoft Excel team between 1991 and 1994 and later founded Fog Creek Software, which sells Windows-Software.