That 169 address means that it isn't pulling a proper address from the router's DHCP server. You should check that the DHCP server is enabled in the router. Also check that the mac address filtering of the router is off - or - that if it is set to on, that the computer's wireless adapter mac address is added to the whitelist.
In Windows' start menu, type services.msc then press enter. Use this screen to make sure the DHCP client service is set to automatic and also currently started and running too.
Also make sure that the WLAN AutoConfig service is set the same and running too.
If you have any software installed for the wireless adapter, uninstall it. Make sure it doesn't uninstall the driver itself though.