Of course, with the aid of Google and the many good folks who like to share on the 'net, workarounds abound. However, one problem you can end up with, given the hit-or-miss nature of manufacturer support for Windows 7, is a bunch of installed drivers that you don't need. I found this page helpful in dealing with this:
Uninstall Drivers from Vista & Windows 7
Do bear in mind the author's advice to make copies of drivers before you remove them. The thing that surprises me about drivers for Windows 7 is that XP drivers often work okay. I will try to blog more about that when I get my Vaio VGN-S460P fully configured. (Hint: This is one of the machines that Sony has no intention of supporting under Windows 7, but you can do a clean install of Windows 7 and so far it is working well--thanks to a set of original XP drivers.)