Last week first Chrome stopped working. This seemed to be a problem with Norton 360 - when I'd un- and reinstalled this it worked again.
Then I noticed that none of the windows 8 apps work. Some apps, which I think are not windows 8 ones - do run. The ones that don't run have a small "x" to the bottom right of their tile.
The only solution I can find is to "refresh" Windows 8 - which seems to mean uninstalling and reinstalling it, and then having to reinstall all the programmes I've installed since getting the computer. Given how much trouble I had installing e.g. iTunes, Chrome, Firefox... I'd rather not have to do this.