"Duplicate headers received - Error 350"

My grandpa recently sent me an email asking me for help, he reports that on some sites and hyperlinks he gets this error message:

Duplicate headers received - Error 350



Anyone know how to fix this? He uses Google Chrome as his browser.
 

My Computer

System One

  • Manufacturer/Model
    Dell Inspiron 530
    Monitor(s) Displays
    Acer
    Screen Resolution
    1920x1080
    Keyboard
    Dell/Logitech
    Mouse
    Dell USB Mouse, Logitech Wireless Mouse or Windows Optical
    Other Info
    Thank you for everything you've done for me in the past years. I'm sorry that games require much more than you're capable of, but you'll never be forgotten as my first personal computer <3
The problem is in Chrome, based on my search of the web. The only solution I could find is here-

Google Groups

Since I don't use Chrome, I don't have the foggiest idea what he's talking about.
 

My Computer

System One

  • Operating System
    Vista Home Premium 64 bit SP2
    Manufacturer/Model
    Cyberpower
    CPU
    Intel Quad CPU Q6700 2.67 GHZ
    Motherboard
    NVIDIA 780i
    Memory
    4 GB
    Graphics Card(s)
    MSI GTX 560 TI Twin Frozr
    Sound Card
    Sound Blaster SB Audigy
    Monitor(s) Displays
    Viewsonic VG2436
    Screen Resolution
    1920x1080p
    Hard Drives
    Samsung HD 105SI
    WDC WD20
    Case
    Apevia XJupiter
    Cooling
    air
    Keyboard
    Logitech MX 3200
    Mouse
    Logitech MX 600
    Internet Speed
    30 Mbps
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