There are a lot of these devices getting around most will work on Windows 10 without any driver installation, but for older operating system there may be a need to install drivers. There drivers address the RAlink/MediaTek devices but may work with other generically branded devices.
RALINK 802.11ac WLAN Adapter Driver
File: ralink_wlan_50047000_win_8_164.zip
7b229b873362d695baef0b4e4ae05deda64311908d0f6d65c4426ac2c3c3bcb3
RALINK 802.11ac WLAN Adapter Driver
File: ralink_wireless_pcie_drv_500460000_win.zip
63820dd1acd3f39eebb187d72f25cfd77eb62479d6bc9ded38cc2a0d4f55cc05
RALINK 802.11ac WLAN Adapter Driver
File: ralink_wireless_lan_500380000_win.zip
0eac0c5f4af7f451747580ea99aefdbf28c4ec3054850f9eb1b54d4ea543a8ad