I've tried all the suggestions on the link leocg (sorry for the earlier mis-spelling) gave but unfortunately, despite following everything to the letter, I still can't get Opera 27 (or 26 or 25) to work on my PC. 25 used to work fine until I "upgraded" to 26. Looks like I'll need to switch to Chrome / Firefox /something else, shame as I've enjoyed using Opera for a few years now.