1) Hardware doesn’t run well on Vista (even new hardware)
2) The new security of Vista is overkill most of the time, being prompted for every little thing is bad enough but Vista even labels existing applications as suspicious.
3) Lack of drivers for older and newer hardware.
4) Power options do not change automatically for laptops depending on whether you are plugged or unplugged from a power source.
5) The Start Menu has been redone with a completely different look, unfortunately it is hard to navigate and find what you are looking for.
6) Rebooting a Vista machine is supposed to be faster, but it actually takes longer to reboot than XP.
7) The much talked about Aero UI is great to look at, but with all the resources it takes just to run it all you will be able to do is look at it and not actually work on your pc.
8 ) The many different versions of Vista will be confusing to some basic computer users who are not sure of what exactly they need so in the end they will probably figure more expensive means better and pay for a version they don’t need in the first place.
9) Horrible graphics performance that was not an issue with XP.
10) Although the look is “improved” basic functions like add/remove programs are hard to find.
11) VPN doesn’t work correctly, even though there are a few work arounds for this it is still not an easy process.
12) Software that is supposed to be windows compatible shuts down randomly.
13) Firefox runs ten times better than IE7 in vista.
14) The sidebar is another resource hog.
15) Readyboost seems like a good idea if you can get it to work.
16) DVD playback through windows media player or media center lacks quality.
17) Minor changes to hardware may prevent the system to boot up.
18) No “open with” when right clicking on a file.