The generic driver doesn't load?
Here is the MFG website:
http://www.a4tech.com/product.asp?cid=&scid=&id=261And Windows 7 isn't listed but if you go to the driver page:
IT states: "no driver is required"
http://www.a4tech.com/download%20driver.asp?cmodnum=KLS-5UPAre the USB ports turned on on this other machine?
What error do you see in Device Manager?
Do any other USB devices work? Can you test a different port?
How are the USB ports configured in BIOS (are they accepting legacy devices?)