Brightness issue Recently updated to Windows 8.1 and not a problem until today. I cleaned the keyboard with a cloth and the brightness went to minimum. The F12 button is not operational now. Any ideas? Thanks

For Windows OS technical errors, the easiest way is to reach Windows technical customer service. They provide an instant solution and help for email setup and password related issues.

Services offered-

Technical support for windows 7
Technical support for windows 8
Technical support for windows 8.1
Technical support for windwos 10
Support for windows XP
Windows update
WIndows uninstall, install, reinstall
Fix corrupted windows
Windows BSOD error

Dial directly 1888-315-9712

or visit toll-free Windows Technical Support Number from the below link-

windows 10 technical support

Your problem is not the driver of that scanner but the system corruption of Windows 8.1 and if you don't solve this issue now, you'll be suffering this "karma" until system finally collapses.
If Windows 8.1 update went wrong, EVERYTHING is wrong. You should backup all your data and do a factory reset for Windows 8 and then update to Windows 8.1
If Windows 8 came preinstalled in your laptop you should have a recovery partition on your hard drive.
There are several tutorials how to do a system reset. Read them and follow the one you best understand.

Reset your PC from Windows 8 Recovery Drive

How to reinstall Windows like pro

How do access Windows 8 Recovery partition and how to recover it to...

How to refresh reset or restore your PC Windows Help

Try this:
https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Z400-Adjusting-the-Brightness-in-Windows-8-1/ta-p/1303113

Hello,

Scan your computer for outdated drivers using RadarSync. You might have an outdated keyboard driver. Once it has the results, search for the updates using Google based on the name which will show up in RadarSync. Or, you can buy the license to let it update them all.

I hope this helps!

David

1) There should be a keyboard shortcut for increasing the brightness of the screen. Try that.
2) Sounds like the video card driver issue, hp may have updated driver to fix that.
3) Try system restore to well known date that you know the laptop worked perfectly.
4) Go to BIOS F10 for HP, restore default/factory settings.
5) BIOS update is last thing, may resolve the video brightness issue with the laptop, see HP website according to your model number or serial number of your laptop. Make sure the laptop has battery charged to at least 50% or more and power adapter is plugged in throughout the BIOS update procedure.

Turn on your Acer laptop and go into the BIOS. Reset it to factory defaults and press F10 to save changes and exit.

Once your laptop starts to reboot, check to see if the num lock and caps lock are still on. If they are then turn off the laptop and you'll have to take out the keyboard, clean off the ribbon to make sure there are no specs of dirt or dust on it. You can use a cloth, something soft to wipe it off.

Now got ahead and put the keyboard back on and turn on the laptop, if you the num lock and caps lock are still on then that means the keyboard is bad and would need to be replaced.

windows 8 to 10 have the brightness control in the action center or power settings or look in the charms bar if your using windows 8 or 8.1 (note: if brightness doesnt change it maybe due to the OS not knowing how to change the brightness let me know if that ends up being the case)

there are some compatibility issues with windows 7 still...update ur windows 7

I had the same kind of problem with my Merc Zboard gaming Keyboard. I had to uninstall the software for the board. I then went to the manufacture's website and downloaded the updated drivers directly from them. This fixed my gaming issues 100% ^_^