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Hello, PierreBourne
Welcome to the Microsoft Community.
Thank you very much for your feedback. I have carefully read the information and problem description you provided. You mentioned that your computer's upload speed is normal, but the download speed is 0.
I understand the problem that this problem causes you. Based on your problem description, it seems that your laptop may have encountered a network configuration or driver problem, which may cause the download speed to be 0 while the upload speed is normal. At present, I can't give you an exact cause of the problem. I suggest that you can try the following methods to step through the errors, which may help you.
Method 1. First, I suggest that you try to reset your network settings
Press the Windows + I keys to open Settings.
Click "Network and Internet".
Scroll to the bottom of the page and select "Advanced network settings".
Under "More settings", click "Network reset".
Click "Reset now" and follow the prompts. After restarting the computer, reconnect to the network.
Method 2. Update or reinstall the network driver
Right-click the Start button and select "Device Manager".
Expand the "Network adapters" section and find your wireless network card or Ethernet adapter.
Right-click the network adapter and select "Update Driver".
Select "Search automatically for updated drivers" to have the system check for and install the latest driver.
If Windows does not find a suitable driver, you may need to visit your device manufacturer's official website to download and manually install the latest driver.
Method 3. Check firewall and security software. Some firewall settings or security software may block downloads.
Press Windows + R keys, type control firewall.cpl and press Enter to open Windows Firewall settings.
Click "Turn Windows Firewall on or off" to temporarily turn off the firewall to test download issues.
Temporarily disable any third-party security or antivirus software, then try to download content to see if it improves.
Disclaimer: Performing the following steps temporarily turns off antivirus protection in your protection software to help you identify the cause of the problem, but keep in mind that turning off this feature may make your device vulnerable to threats. So once the problem is solved, please enable the protection software immediately.
Method 4. You can use the command prompt to reset TCP/IP and DNS settings:
Open the command prompt (as administrator):
Type "cmd" in the search box, right-click "Command Prompt", and select "Run as administrator".
Type the following commands and execute them one by one (press Enter after each line of command):
netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns
After running the above commands, restart your computer.
Method 5. Check the router and network configuration, make sure the router and network are configured correctly
Disconnect the router power, wait 30 seconds, then reconnect and restart the router.
Also, please confirm that other devices on the same network have no download speed issues. If other devices are normal, the problem may be with the specific computer settings.
Best regards
Brian - Microsoft Community Support Specialist