I installed the 8.1 beta back in July and just for outlook alone im glad I did. However, there are bugs on my machine, particularly with Bing News which keeps crashing. So I tried to "Refresh" windows to see if that would cure it as im sure these crashes didn't occur when I first installed. However, when I try it I get the following message "INSERT MEDIA - Some files are missing. Your windows installation or recovery media will have these files". Anyone else come across this? Is it just not possible to refresh the 8.1 beta version?