No$GBA Freezing

Hey, I'm new to the site here and um.. Well it seems No$GBA freezes every time I try to play a game.
And NDeSmuME tells me it isnt a nds file, even though it is.

I've got a few questions.Are you extracting the files you have downloaded using Winrar or Winzip?
What version of No$GBA are you using?
What roms are you trying to play?
Is No$GBA locking up, or is it just not playing the game correctly? Staying on a blank white or black screen until you close it?