After installing Windows 8 yesterday, I discovered some interaction problems with my main tool, Visual Studio 2012. Debugging Azure has suddenly become difficult. So after installing the OS upgrade, I spent about five hours re-installing or repairing a whole bunch of other apps, and I'm not even sure I found the causes of the problems.
The next step is to install new WiFi drivers. But seriously, I'm only a few troubleshooting steps from rebuilding the computer from scratch back on Windows 7.
Cue the cursing...