So so I really like Window 8. I started by trying an upgrade of my windows 7 install but was marred by blue screens of death. Not fun.... So I though it would be best to do a clean install (I wanted to anyway, I was just being lazy) but the BSODs continued....
ndis.sys and aswnet.sys were the culprits... This problem proved to be my Avast security suite... One uninstall and hey presto the system was fully functional again.
Avast say that program version 7.0.1473
(announcement: http://forum.avast.com/index.php?topic=107531.0 ) is fully compatible but it looks like a fair few people are seeing the same issue:
I think I'll wait for a few more updates before installing it again. Overall I'm really liking the UI of windows 8. It takes a bit of getting used to but once you realise you can just start typing from the start screen to search for what you want its dead quick to navigate!