Acer Aspir E5 will not recoznize dual screen

heartland11
heartland11 Member Posts: 10 New User

hi all \i ahave a Acer aspire E15

i just added a lcd monitor but i cannot get the dua l screen to work 

when i go to devices there is a yellow triangle beside the laptop

it said usb controller doesnt have a driver"

 

thanks

Answers