When I hover my mouse on Ralink icon it's saying: ,,Ralink Wireless LAN Card Not exist" What can I do?

Need more details, did you actually install the wireless card? Or is that the onboard card in your laptop? Did it work before? Need some details about the issue, how it happened, what you tried already. Did you check Device Manager and see if there are any errors? Try running the drivers for the WiFi card from the vendor support page?