Problem with usb keyboard on Dell Vostro 3560

Hello everybody,

I have a problem with Dell Vostro 3560 laptop (the OS is Windows 7 Professionnal in 64 bits).

In fact, when i connect my usb keyboard (the brand is dell) on the laptop, i don't have a problem (the usb keyboard's driver achieve without problem) but when i disconnect the usb keyboard, the screen freezes and i'm obliged to restart my laptop.

Everybody have already this problem ?

I need some help because it's for my company (i work in a computing company) precisely for a colleague.

Thank you so much in advance.

greenkev