Dell Latitude unknown device usb\vid_138
Go to http://support.dell.com select your device
Select Operating System
Under Security Download Validity Driver
Sensor (VFS5011)
http://www.dell.com/support/drivers/us/en/04/DriverDetails/DriverFileFormats?DriverId=TKW61&FileId=2731100530&productCode=vostro-3550&urlProductCode=False