I’ve run across no fewer than three laptops and PCs this week that were upgraded from Vista to Windows 7. In all three cases, there was something glitchy going on, like missing device drivers, browser problems, and malware that seemed to get in despite the best efforts of anti-virus and other security software usage.
My conclusion is that upgrading from Vista requires a complete format and re-install of Windows. If you follow just what Microsoft does in the Win 7 upgrade, you’ll probably end up with legacy Vista issues. Sorry I don’t have better news because Windows 7 is definitely where you want to be, but it will be more work than you’re expecting if you’re starting with Vista.