I tried to download a minecraft mod and it is upside down?

Is your whole computer screen upside-down? If that's the case hold left ctrl+alt and then hit the up arrow. If its only Minecraft that's upside-down make sure your video card drivers are up to date and you have (at minimum) DirectX 10 installed (get 11 for Windows 7). If it's only upside-down when you run Hexxit there might be something wrong in the mod pack, so try a different one. Hope this helps!