Downloading .xls on Yahoo email

I don't see any solutions for the problem of opening an Excel spreadsheet
in Yahoo email. I have not added any recent programs, and am fully protected by McAfee. Once in a while an attachment will open right up, but most times it just hangs. I had switched back and forth to classic in Yahoo, but still doesn't work. Does this help desk actually resolve these problems, or is this just a place for people to chat?