GW Instek PCS-1000 - Manual (Page 49)

COMMUNICATION INTERFACE
49
choose Install this driver software anyway.
5. The PCS-1000 will now become available in the
device tree under PORTS (COM & LPT) in the
Windows Device Manager.
Alternate
Installation If the Found New Hardware wizard does not
appear or you wish to install the driver from
another location, the driver can be also installed
from the Windows Device Manager.
1. Open the Windows Device Manager. Using
Windows 7, press:
Start>Control Panel>Hardware and Sound>Device
Manager
2. From the device tree go to: Other devices>USB
Serial Port
The yellow error sign indicates that a driver has not
been installed.