My 2 zumo 32U4 are not recognized by my computer

hello , my 2 zumo 32U4 are not recognized by my computer , when i connect my zumo 32U4 on my computer , it shows me unrecognized device , can you help me please .
thank …

Hello @Julien2 ,

Which operating system are you using?

Here are the instruction for Windows installation: https://www.pololu.com/docs/0J61/6.1

and how to program it with Arduino IDE: https://www.pololu.com/docs/0J61/6.2