how to dim or brighten vista screen

How do I dim/darken my vista desktop screen? I searched "Control Panel" and can't find anything. I also googled such a topic and I am not satisfied with the answers. There is a option at the right side of my computer but when I touch the screen, it makes a loud bleep noise. This doesn't help when I am in a dark room where other people are trying to sleep. My second question is how do I silence that noise. Thanks
 

My Computer

To my knowledge screen brightness is not a windows setting but rather it is something that is hardware specific. If your computer supports screen brightness changes then there should be a utility or key that controls it. As for the sound look for that setting in the utility that control brightness.
 

My Computers

System One System Two

  • Operating System
    Windows 8.1 Industry Pro x64
    Manufacturer/Model
    HP Pavillion Elite HPE-250f
    CPU
    Intel i7 860 Quad core 2.8 ghz
    Memory
    8 gb
    Graphics Card(s)
    ATI Radeon HD 5770 1 gb ram
    Monitor(s) Displays
    Alienware 25 AW2521HF
    Screen Resolution
    1920x1080 &1680x1050
    Hard Drives
    1 TB x2
    Other Info
    https://www.cnet.com/products/hp-pavilion-elite-hpe-250f/
  • Operating System
    Windows 2012 R2 Data center/Linux Mint
    Manufacturer/Model
    Dell Poweredge T140
    CPU
    i3 9100 3.6GHz, 8M cache, 4C/4T
    Memory
    8GB 2666MT/s DDR4 ECC UDIMM
    Screen Resolution
    1680x1050
    Hard Drives
    1 TB & 360 GB x2
    Other Info
    https://www.dell.com/en-us/work/shop/productdetailstxn/poweredge-t140?~ck=bt

My Computer

System One

  • Manufacturer/Model
    Self Built
    CPU
    Intel I5-2500K @3.3GHz
    Motherboard
    Asrock P67 Extreme4
    Memory
    16GB G.Skill Ripjaws X (4x4GB)
    Graphics Card(s)
    EVGA GeForce 750 Ti SC 2GB
    Sound Card
    ASUS Xonar DG 5.1 Channels 24-bit 96KHz PCI Interface Sound
    Monitor(s) Displays
    auria eq2367
    Screen Resolution
    1920 x 1080
    Hard Drives
    250GB Samsung 850 EVO SSD
    1TB WD Blue
    1TB Hitachi
    PSU
    SeaSonic X 650W 80 Plus Gold
    Case
    Corsair Obsidian 750D
    Cooling
    Corsair H60, Three 140mm case fans
    Keyboard
    Logitech Wireless Keyboard K520
    Mouse
    Logitech Wireless Mouse M310
    Internet Speed
    Wave Broadband ~ 100 down 5 Up
    Other Info
    Laptop specs: HP g7-1365dx /
    CPU: AMD A6-3420M APU with Radeon(tm) HD Graphics /
    RAM: Crucial 8Gb (2x4Gb) /
    SSD: Crucial M4-CT128M4SSD2 ATA Device/ FW 000F /
    GFX: AMD Radeon HD 6520G /
    OS: Windows 10 Pro x64
What is the make model of your computer?

If you have Nvidia control panel you can change the brightness using this application.

To eliminate windows system sounds, go to control panel sound,
click on sounds, in sound scheme click on the down arrow and select none. Click on the tick so it dissapears under play windows startup sound.
 

My Computer

System One

  • Manufacturer/Model
    Self Built
    CPU
    I5 3570K
    Motherboard
    Gigabyte Z77-DS3H
    Memory
    4 x 4GB corsair ballistix sport DDR3 1600 Mhz
    Graphics Card(s)
    Gigabyte Geforce GTX 660 TI
    Sound Card
    creative x-fi
    Monitor(s) Displays
    Primary CiBox 22" Widescreen LCD ,Secondary Dell 22" Widescreen
    Screen Resolution
    Both 1680 x 1050
    Hard Drives
    2 x 500G HD (SATA) 1 x 2TB USB
    PSU
    Corsair HX 620W ATX2.2 Modular SLI Complient PSU
    Case
    Antec 900 Ultimate Gaming Case
    Cooling
    3 x 80mm tri led front, 120mm side 120mm back, 200mm top
    Keyboard
    Logik
    Mouse
    Technika TKOPTM2
    Internet Speed
    288 / 4000
    Other Info
    Creative Inspire 7.1 T7900 Speakers
    Trust Graphics Tablet
You probably already tried but Did you right click on the power options in the task bar because the screen brightness can be changed from there,
 

My Computer

System One

  • Manufacturer/Model
    ACER Aspire 5338
    CPU
    Celeron Dual Core T3000
    Motherboard
    Acer JV50
    Memory
    8GB
    Screen Resolution
    1366X768
    Hard Drives
    Hitachi 233GB
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