I can't install the Arduino Leonardo driver

Development Tools IDE 1.x
1

Hello,
I have Windows 7 64-Bit Version and bought a Arduino Leonardo Board. I recognized that i can't select a port so i wanted to install the driver. So i go on the device manager, select my board, and show Windows, where the driver is. But Windows says that there is no driver found.
What can I do?
Thanks for help,
lpehle

2

I found a solution. Some USB ports don't work. I picked another one and now it works.