Adobe Reader DC not opening files - What do I do?

I recently, April 14th, updated my Adobe Reader to the latest DC version. But, as I am trying to open/download files I've received via e-mail or from online, DC comes up for about 1 second before disappearing/closing. I saved some documents to my computer and tried pulling them up that way, and it works this way. But, I don't want to save every file. I'd have to save the file, go to the Downloads folder, open to read, and delete if I don't want it or re-save if I do.
That can I do?
I have an HP Pavilion laptop, Windows 7.
Thanks much.
G.

pwillener, Thanks for trying to help, but, though I disabled protected mode as you mentioned, Reader DC is still not opening files I'm trying to download. It's just coming up for a few seconds and closing.

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