system
11
Problem solved!
Let me tell you how. My plan was: 1)uninstall avast (version 260) 2)install the new version (268). So I stopped the program and went to the add/remove programs in the Control Panel. Then the setup program gave me the chance to update so I decided to try again from there and… Bingo! the update worked well. Now I have installed the new version of avast. It seems to me that the problem was the antivirus was running during update. I’ll try again the update feature when a new version is released.
Thanks for your replies!