The XylocUSB - W2KXP Windows driver is a driver for a USB device, likely associated with a product from Xyloc, which could be related to a USB hardware device such as a USB key, security token, or encryption device. The "W2KXP" part of the name suggests that this driver is intended for Windows 2000 and Windows XP operating systems.
The XylocUSB driver allows the device to function correctly by enabling communication between the device and the computer running these versions of Windows.