I accidentally pressed some buttons on my keyboard earlier and now everything on my screen is HUGE. I don't know why. Plus I've lost the menu bar thing at the bottom of my screen =/ Help please?

Everything on your screen, as in on the page? or desktop, too? If its the internet page, hold CTRL and scroll up and down until the size is alright. And what Menu Bar? The Task Menu? or the status bar on the internet page?

Get a Mac. There is no shortcut on the keyboard to do that. I love my Macintosh.