My Wi-Fi is constantly going down. My Internet supplier confirms router is OK, but suggests I may need to update my Ralink Card drivers. Can you advise, please?
Ralink is now Mediatek. The company was acquired by Mediatek. You will have to visit the downloads page in order to download the necessary drivers for your device.
Download page: http://www.mediatek.com/en/downloads/
After you've downloaded the correct drivers, remove the current ones and then install the new ones. Reboot the computer and it should work.