USB EMP Audio Device drivers

Recently purchased two items at thrift stores, and they both give the message that they need a USB EMP audio device driver.

System is a Presario X1200 laptop running WinXP, SP3, fully updated.

First device was a pair of Logitech V20 USB speakers. Found "no software for this device" on Logitech's site. Second device is a VoIP phone -- no tags/labels, so I can't identify mfgr. Just wondering if this driver should be part of OS, or where to download. Leery of some of the sites that make you run wizard and register before finding driver.