Let me count the ways:
1) Obsessive checking for certification. I needed to reinstall Realtek drivers which are not signed. A five minute instsall took forever, requiring I manually confirm my desire to install everything.
2) The babysitting. When I want to open, change or install I need to double verify, sometimes tripple my intent.
3) Some driver conflicts.
4) Loss of control.
5) The nasty habit of selling a lesser version and pushing an upgrade. The combination is more expensive than the higher version would be alone. In my case I need to do this because Ultimate recognizes drives Home Premium does not, a fact conveniently left out on the Microsoft comparison page.
6) Relocation of access of various resources. "Oh, that's where they put it."
7) I haven't yet been able to set up my Start menu the way I want to.
8) Everything goes by default into my documents. I hate my documents, having chosen long ago to give various programs their own data storage space on a separate drive (this has served me well many times, apart from the fact that Vista won't recognize the drive). "My Pictures" and "My Scrapbooking" or whatever it is are pita when what I really want is My Client Database.
9) The benighted 3D hype. I don't want or need it, it snacks on memory. It's a gimmick.
10) Did I mention that my sound, too disappeared after some infernal upgrade and it took me over a week to figure out what to do, after uninstalling a lot including some security updates (will see what happens when I reinstall them.) The Vista sound issue is wide spread.
11) Hopefully not y'all's problem, as you are too smart to do something this hair brained: I made the bone headed mistake of buying an off the shelf computer and got Acer's tweaked OS. Vista's culpability with groups like Acer, which tweak.
12) IE7. I had a mother. She's dead and I miss her but now my browser is channeling her less appealing mannerisms. You'll put your eye out.
13) Ongoing lack of drivers for some legacy hardware, which may be over two years old but would still work fine. Let's poison another landfill. Oh, wait, I can't do it. I have to take half a day to drive it to the recycling center.
14) Incompatibility with some programs. I made money off of vista by buying stock in some companies which were bound to have a boost from a system which made heaps of programs useless. My old Corel Illustrator only draws square circles. Adobe Illustrator does not work properly. Forget older web design programs, (Yes, I know that the Web has progressed). Many smaller apps still not up to speed, and No, Compatibility Mode Does Not Solve The Problem..
15) I have turned of many automatic updates and they continue to update, which sr**s things up. Have lost date when the blasted system just says: "Save everything. Shutting down in a couple of secs, buddy. Tough luck."
16) Did I mention lack of control, or was that someone else?
17) I don't know about other manufacturers, but Acer's tech service stands before Vista issues like deer in the headlights. If tech doesn't get it, then it's just too messed up. I take full responsibility for buying that system, though.
18) I would upgrade memory, but from what I have read Vista rarely recognizes more than about 2gb. Maybe wrong?
I am in an odd situation. I have and love XP64 on my main desktop, but exchanged it for oem (I built it, so it's righteous) Vista Ultimate -- MS was being obtuse, so the parts people just exchanged it. Reason was that there are a lot fewer drivers for XP64 than Vista, but this is becoming a non issue. I haven't upgraded yet. I would rather, I think, keep XP64 on the office (buying a new and legitimate copy) and move the OEM to the home computer. Anyone know how much trouble MS will make on that?