Wireless Internet stopped working

I was useing my computer as normal when all of a sudden it restarted itself while i was playing an online game.
i logged back onto my username and my wireless wasnt working even though the green light on my dongle was still on. The weird thing is, mine and my moms laptops wireless is still working so it cant have anything to do with the router,

Has anyone got any ideas or will i have to reinstall my wireless drivers?

regards,

Mattie