The 802.11n standard achieves high speeds by bonding two 20MHz channels into a single 40MHz channel. Windows 7 drivers have a default power setting and channel width configuration that often needs manual adjustment.
When a user seeks an "802.11n driver," they are rarely looking for a driver from a specific Wi-Fi brand (like Netgear or TP-Link). They are looking for the driver of the internal chipset. The most prevalent chipsets during the Windows 7 era were manufactured by a handful of OEMs:
