Need Help with Keyboard Controls

I just got a keyboard cover for my MacBook. I was testing around typing to see if it slowed my typing and somehow messed something up. Some keys are doing other functions now. For ex: the volume up key now brings up my widgets and the volume down hides everything on the screen to show the desktop.

If anyone knows what to do to restore the key bindings to default please let me know because this is a bit annoying.

Thanks in advance for any help.

also, there is some weird looking black box around windows and also on firefox around the red button at the top left to close the window. just including that if that helps.

You've activated some Universal Access controls by accident. Go into the Universal Access system preference panel and turn them off.