my older hp laptop screen is now dim and I cannot adjust it. It has a touch screen and windows 8.1

[barbey]

My older hp laptop has a very dim screen. It has a touch screen and is now on windows 8.1. It originally was not an hp laptop.

What should I do?

 

[Phillip Corcoran]

"It originally was not an hp laptop"

Huh? What was it then?