Plutonium

I keep getting this error on my Windows 10 computer saying that this file can't be found. I didn't delete anything, so I'm not sure what happened to it, or how can I fix it:

I would like to know how can I fix this. This is also a problem I'm having when I try to launch BO2 zombies and then the launcher closes out and does nothing.

As someone new to this service, I would like to know if the BO2 download (piry.exe) is safe to download, as my Windows 10 computer treats it as being an unrecognized app. I don't want to put my computer destroyed because of this, because I'm afraid I might make my computer unusuable if I run it.