Hey guys so you know whenever I try to put in NFs particle effects the game pauses but the mouse still moves and I can't click on anything.
Can anyone help me?

It doesn't support that specific file.

Have you put the particles in the "particles" folder? I had trouble doing that until I figured it out myself. If the particles are in the style / theme folder, the particles will freeze and either do no :svsd for :svsd or what it is doing to your game. See if that helps