IDE might have problem.download new IDE.All IDE works same. Its better to get started with 1.0.6.
If You are running Windows 7 click the tab on the taskbar and press Win + Right or Win + Left a couple of times. Most of the time this will make the invisible window appear.
Somehow I fixed it, now it works. All I did was click on tools, and then port and clicked on the port. I only have one arduino hooked up, i'm use to it picking that up automatically and asking me if i'd like to switch.