...what messages you're getting. There should be no reason this can't be made to work. Of course if you're trying to open files made by some program you haven't reinstalled, that's one possibility. However without knowing the details, we can't say whether that's what you're running into or not.
I am a 68 YO with novice experience. I have Windows 7, and unfortunately use YAHOO. I download from my dvd to computer disc (C), but cannot open or transfer the files from Downloads afterwards. I cannot attach the files to e-mail or f/b.

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