Another one. Now when I try to download any file not from a disk, I get the following: The Signature of setup(download file).exe is corrupt or in valid. I had this once before and the fix was to go to Internet Options, Advanced and scroll to "Allow invalid files", did not work. Need help again. BTW I am running Win 8.1, Dell XPS 8700 .i7, 1T HDD, 16 Ram T.I.A.