
If you know your adapter's brand, use these official support pages:
Intel Wireless LAN (802.11/b/g/n) for Windows 7 (32-bit, 64-bit), XP
Look for an entry like "802.11n WLAN" or "USB Wireless LAN Card".
Since the adapter is likely a generic brand, the best way to find the driver is to identify the chipset inside the device using Windows Device Manager.
: Frequently used in budget adapters; drivers can often be found by searching for the "MT7601" or "RT5370" chipset . Manual Installation Guide