Hi Shalim,
I'm Christine, a Windows user like you. I'll do my best to help you. I can see here that you're unable to change your screen brightness. Let me help you with that.
May I know when did the issue start? Is there any changes made?
Please send the make and model of your device. (Please press Windows key + R and type msinfo32 and hit enter, look for system model)
Which version of Windows are you using? (Please press Windows key+R and type winver and hit enter)
Please check and follow the steps below:
https://support.microsoft.com/en-us/windows/cha...
Please let me know the result. I'll be happy to assist you all the way until it's resolved.
Thank you,
Christine L
Independent Advisor