I bought this microscope XCSOURCE 20x-800x Stand TE71 before about 1week, Delivery was very fast with me. The installation, however, took a little longer, the driver was installed under Windows 8.1, did not want to work, but now I get the microscope up and running, after I uninstall the driver in Device Manager, and then reconnect to the Microscope was reinstalled into the USB port of the driver, it works well, what does not work is the Digital ZOOM. I have installed the microscope under Win XP Service Pack 3, this worked right away and the zoom function is given here. Point deduction there from me for a little shaky stand and adjust very tenacious the magnification wheel.