169 means that you are not getting an IP address from the DHCP server. There are lots of reasons, and as many things to try to troubleshoot.
Start with rebooting EVERYTHING. Computer, router and modem. Actually cut the power to the router and modem. You do this by unplugging them from the wall. Turning them off is not the same. Turning off the power strip is not the same. Keep them that way for a full minute or longer, then plug everything back in. Wait for it all to reconnect with each other and try again.
If that doesn't work:
Try to connect with an ethernet cable instead of wireless. You can also repair permissions and if none of this works:
you can try creating a new network to see if you can connect to it.
Report back if you don't get anywhere with these.