won't download and play movies

won't download and play movies

I had an old ZTE Zmax Pro for 1 yr and never had any download issues. I just bought a new ZTE Blade and I can download apps from google play & 3rd party dwnloaders but it won't download any shows/movies. It will show it in the downloader but sometimes quits about 50% thru or go all the way then when I select it I get a "can't play file". I've tried many diff other vplayr apps or dwnlr apps & nothing. Can u help????