Brenda Ann wrote:

Many pieces of hardware do not, and will not, have drivers for Vista.

Various versions of Vista have extremely restrictive DCMA software that
won't even let you load or play your own ripped mp3 files or pre-recorded
video.

There have also been issues with various application programs not running in
Vista, requiring you to install and run a "virtual machine" to run Windows
XP compliant programs. In addition to this, Vista dropped all "legacy"
support for 16 bit software. This is not normally a problem for most users,
but some have "favorite" screen savers or nostalgic video games that will no
longer run on Vista (or Windows 7 for that matter). Vista will not run most
emulators without tweaking.

A lot of words to say that Vista is a P.O.S. :-)