Dual boot gone wrong windows 7

Hello, I've downloaded the iso of windows seven onto a USB key, then i used boot camp on my mac to dual boot with windows 7 . But it's asking me now to insert boot device and press any key, i've inserted the usb key but the keyboard wont respond.

I'm now stuck on that screen.

Your help will be much appreciated

thank you

We need more info. Version of OS X? Your Mac - model, year?

You can not use a wireless keyboard when installing Windows via the Boot Camp assistant. If you are, switch to a wired keyboard - any USB wired keyboard should work. Assuming you downloaded the Windows 7 iso from Microsoft or your school, make sure you have properly burned it to the USB flash drive so that it's bootable.