电脑网络最高只有2格（有5格）

You can try reinstall Wifi Driver

Even if you've updated the driver, fully removing and reinstalling may help:

• Press Win + X → Device Manager
• Expand Network adapters
• Right-click your Wi-Fi adapter
• Uninstall device
• Check the box for "Delete the driver software for this device"
• Restart your computer

Windows will auto-install a fresh default driver. If not, plug in Ethernet temporarily or use another PC to download the latest driver from the manufacturer’s site (e.g., Intel, Realtek).

Or you can manually download it :

First, you need to identify Your Wi-Fi Adapter

• Press Win + X, then click Device Manager.
• Expand Network adapters.
• Look for something like:
  • Intel® Dual Band Wireless-AC 3165
  • Realtek 8821CE Wireless LAN
  • MediaTek MT7921 (Note down the full name)

Step 2: Go to the Manufacturer’s Website and search Google with this format:

[Intel/Realtek/MediaTek] [Your adapter name] Wi-Fi driver site:[manufacturer.com]

Or use direct links:

• Intel: https://www.intel.com/content/www/us/en/download-center/home.html
• Realtek: https://www.realtek.com/en/downloads
• MediaTek: https://www.mediatek.com/products/broadbandWifi/downloads (or get from PC/laptop manufacturer)