Half a million Lego pieces put together in an amazing life size air powered car that is able to reach speeds up to 20 mph, how incredible does that sound?
You deleted everything from your USB key or a drive, so there should be enough free space to copy the new files, but you still get the not enough free space message in Mac OS X? This is what you need to do.
If you put your computer into hibernation, the next time you turn it on, you'll get all your windows and programs open just the way they were before the shutdown.