|"it means the logitec speakers run power from a plug that go,s in to a socket in the wall"|
I'm guessing English isn't your native language? Let me try again & tell me if I'm right or wrong - you're telling us that the Logitech speakers function correctly when plugged into the wall & connected to the computer, right? In other words, the computer sound works with the Logitech but not with the USB speakers?
Other than that, please re-read the above responses then post the MAKE/MODEL OF THE USB SPEAKERS (yes, I'm YELLING!). You were asked 3 times & just seem to be ignoring the question. And while you're at it, post the make/model of the motherboard. How do you expect to get any help if you refuse to post any specs?
Did you install the speaker drivers? Win7 won't recognize the speakers without them. They are NOT on the motherboard drivers disc, they are on the USB Speakers drivers disc. If you don't have the disc, go to the Speaker manufacturers website & download them.