Hi, my brightness keys are not working on my HP EliteBook Folio 1040. Please help

[K_Musau]

Hey any time I press the brightness keys on my laptop, I get an error saying that a certain framework has not been installed in the system. How do I solve this issue?

[Paul_Tikkanen · Accepted solution]

Hi:

You have to install Net framework 3.5.

You can do that by going to the Windows control panel>programs>Turn Windows features on or off.

A window will open.  Check the first box listed to install Net Framework 3.5.

[K_Musau]

Thank you, I solved the issue

[Paul_Tikkanen]

You're very welcome.

[mical]

I tried to do as per instruction but the  keys are still not working,please may u look to it as i have been checking with other options without success.