Worst Windows Experience that forced YOU to switch?
To give a little background, my first computer was a DOS system in 1990, and I started using Windows a few years after that. I had learned to reformat/reinstall, troubleshoot driver conflicts, etc. This wasn't because I enjoyed it, although I can enjoy the tinkering if it wasn't something that *needed* to be fixed. Things needed to be fixed just to use the computer properly, and over time I got really sick of it.
But what really pushed me over was a mother/logic board upgrade. The old one had died, so I was forced to buy a new one. Right before that failure I was using Windows 2000 successfully for a few months, eventhough it was still Windows and had many Windows flaws it was fairly stable and allowed me to be more productive.
When I upgraded to a new board to replace the broken one, I could not run or install Windows 2000. I tried many things to get it to work, but I wouldn't install. This forced me back to the horribly unstable and barely usable Windows 98. Using Windows 98 again made me decide that as soon as I could save enough money I would buy a Mac. Late that year (Dec. 2002) I bought a PowerBook G4.
Since then I've never looked back, my machine still runs flawlessly except that I recently been using more processor extensive programs.
But if the old motherboard hadn't had died, I would have still been using Windows 2000, which would have delayed my Mac purchase. Up to the time I switched, I had not had a virus on my Windows machine for many years, perhaps because I never used Internet Explorer or Outlook.
I've also tried Linux, but it was a pain to install and setup. I'm more than confident that it's a stable OS and if I spent the time on it I could have gotten it going, but I didn't have the time nor did I want to (burned from using Windows).