This is a driver signature enforcement error.
Many users successfully install the RTL8187 driver on Windows 10, only to find that the internet works for 5 minutes and then drops out completely. This is the most common complaint with this chipset on modern OS. rtl8187 wireless driver windows 10 64bit download best
⚠️ As of 2026, no official Realtek driver has been updated for Win10 beyond ~2014, but the inbox driver works for most adapters (e.g., Alfa AWUS036H). This is a driver signature enforcement error