Since then, when I start up the computer, it goes through a few startup steps and then ends up with a black screen with a blinking cursor at the top.

<Original title: Boot Menu>

I mistakenly left a USB key in the port when I rebooted my computer (Windows 7).

Since then, when I start up the computer, it goes through a few startup steps and then ends up with a black screen with a blinking cursor at the top.

If I press ESC during the bootup and access the boot menu, something labeled WED....... is highlighted and I press enter and it starts up normally. 

How can I get Windows 7 to do a normal startup without having to access the Boot Menu each time?

Thanks.