System isn't recognising USB devices

>I have the following problem: trying to get a Logitech Headset running I
> start a prog called "music anywhere" is started. I always gives me the
> message "you usb-device isn't connect, please plug in" (that is a rough
> translation), althoug the device is already connected. This also happens
> with
> a Lexmark printer connected via USB, therefore I guess it is an
> OS-problem.
> When checking "Sound" in the system, the headset is displayed an it says
> "in
> use".
>
> Any helpful hint ?
>
>
> jokoeb