Laptop Keeps Making Notification Sounds

Randomly, my laptop started making these noises and I can't figure out why.
It makes the sound every few seconds and is VERY annoying

Things I've tried so far:
Turning it On/Off
Unplugging PS and battery
Unplugging all USB drives
Pressing every key on the keyboard
Disable "Beep" in the Device Manager

This is the sound it's making: Playing Annoying Sound by N/A - picosong
 

My Computer

System One

  • Manufacturer/Model
    VAIO VGN-TT26LN (Laptop)
    CPU
    Inter Core 2 Duo CPU U9600 1.60GHz
    Motherboard
    N/A
    Memory
    DDR-3 3GB
    Graphics Card(s)
    Intel's Integrated Graphics Card
    Sound Card
    N/A
    Monitor(s) Displays
    N/A
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