I think you need a driver for your Ralink RT2800 PCI card-
Is your computer a desktop or a laptop?
And is it 32bit or 64bit?
If you don't know I can look up your computer and find out the specifications but I need to know what kind:
A Toshiba? Hewett Packard? Lenovo? Asus?
When you have time run this command in the terminal it will help.