Comodo Personal Firewall (Free edition) does not install on Windows 8 Developer Preview (at the time of writing):
“This installation does not support target platform”
So I switched to ZoneAlarm Free Firewall, which installed OK.
Next up I couldn’t upload images in WordPress using Internet Explorer 10 Developer Preview, though everything else looked fine, so I assume it is a WordPress bug.
I’m using Google Chrome to write this post now 🙂