It sounds like you are trying to play the .prel file. This is a project file, not a video file.
To create a playable video, you need to output a video of your final video. In Premiere Elements 15, go to Export & Share/Devices/Computer and select the 1920x1080 resolution. Set Format to MP4. The program will output a playable MP4.
No, it's definitely the MP4. I'll include a screenshot below to show what I mean. Up until this point the videos had been coming out just fine, and then they seem to process, finish, and then lose all the data after it completes the output.
This second picture below shows yet another test I'm currently doing. Like I said, the data appears to be outputting just fine, but the end product ends up like the above screenshot shows, with only 28 bytes of data leftover and no finished video to play.
Do you have enough free space on the hard drive?
Yeah, plenty of space, and I even cleared up more just in case.
What program are you using to play it?
Windows Media Player is kind of crappy.
I'd very much recommend the free VLC Media Player.
I've tried Windows Media Player, VLC, and that standard one for windows.
I'm not sure what's going wrong, Neo, but MP4s produced by Premiere Elements definitely do work. I don't know what to recommend to you.
Although 28 bytes of data isn't even a text document, so you've definitely got something going wrong somewhere.
Can you take us step by step through the process you're using to create this MP4?
Can you post a screen capture of your timeline so we can see how things are set up?