This installation script supports Windows 7 for MediaTek Wireless LAN Card. Download the format that suits your computer e.g. Otherwise, you can download just the wireless network adapter drivers at the Download Link below.
RALINK RT2870 WIRELESS LAN CARD DRIVER INSTALL
If you want to install the wireless client as well as the drivers themselves, please visit the MediaTek official website. These drivers were extracted from the official driver installer. Download Original WiFi Card Driver: Wireless Network Adapter Drivers for MediaTek/Ralink RT2860/RT2870 Network Adapters - Drivers for Windows