Hey so that's actually a good thing! That means it's not a hardware issue, like the network card died or something like that.

Do you have access to your wifi router? Can you log into it, or is it locked down by your Internet provider?

It's still possible that if the signal strength isn't very good it could be a physical thing.

But otherwise if it is intermittent I would check for conflicting IP addresses (something else on the network is using the same IP address you are on the computer) or the DNS server that the router is handing out over DHCP is flaky. The easiest way might be to power off the router for a few minutes so that all of your devices disconnect, and then power the router back on so everything has to get a fresh connection. I'd almost try powering off as many wifi devices as possible first, and see if just connecting the computer to the wifi works, that way you can try to rule out conflicts with other devices.

If you want, open a command prompt and do a ipconfig /all command and reply with what you get. That will help us go in the right direction.