In a command prompt::
ipconfig /all
Near the beginning of that output will be the IP address your network interface is using, along with it's gateway address and the address of your DNS server. If your IP address starts with 169, then you're not getting an address from your DHCP server, and nothing is going to work. If it's not 169. something, make a note of the gateway and DNS.
Now enter:
ping {gateway address} (If your gateway is 192.168.1.1, then the command would be ping 192.168.1.1)
If that succeeds then ping your DNS server. If the DNS server is the same as the gateway, don't bother, ping 8.8.8.8 instead.
If that succeeds, then ping something by its name, i.e. ping google.com
Getting a 169 address means DHCP isn't working. Resetting your router might fix that, but it may also be that your wireless connection is not actually connected. You may have to tell your device to forget the connection and build it anew.
If you're connected with a valid address but unable to ping your gateway, that indicated any number of odd, even serious issues.
Pinging an outside address confirms that your router lets you out to the Internet. Pinging by name confirms that DNS is working.
The stage at which the pings fail points you to where the problem lies with your connection.