Follow the earlier advice on restarting the modem, waiting until it is online before turning the router back on, restarting the pc last. This nearly always restores connectivity at my house.
Once you get it working, and if you ever want to supercharge that router, look into DD-WRT. Good stuff.
Do a hard boot on your router, DSL modem and computer.
Sometimes you have to do this. I do now and again.
Also, be prepared to reenter your encryption key on your computer.
Your router is 192.168.1.1, so that should be your Gateway and (usually) DNS in your computer’s TCP/IP settings. Devices connected to the router start at 192.168.1.100.
If you completely reset the router it may have defaulted back to DHCP to assign IPs, so you could try setting your computer to have the IP address automatically assigned.
Could be a number of things. I’ve usually seen that message when a computer doesn’t pull an IP from a DHCP server.
Go, Start>Run>CMD. Type ipconfig /release (wait for it)
Then ipconfig /renew (wait for it)
See if you get an address.