yes depending on the computer
If Minecraft is not running, no it will not slow your computer down.If you have a low end or older computer then playing Minecraft may slow it down a little as it's a fairly hardware intensive game. Just give it as much ram as you can and turn the graphic details down until your happy with it.The Minecraft WiKi has a lot of information on managing the game.
No, you can't
Microsoft word processing is down loading Microsoft word to your computer
double tap space, that drops you
It's making noise because the harddrive is loading or something. Which makes it go slower because it's loading.
computer doesn't meet the requirements.
popup loading
No, just make sure you down load it directly from Mojang's web site.
Air on Minecraft is anything that isn't a block. Air is the only block that you can move through completely without being slowed down.
down loading is the act of moving a file from a neutral place on the internet to your computer. and yes it can be illegal if you download the wrong types of things.
You can try the mini games at herinteractive.com but you can't play a whole game without downloading sorry