Not knowing your OS and not knowing how Router savvy you are, I still gave you the correct answer, but I did not include possible fixes as you still have to diagnose the DHCP Server and the DHCP Client to find out where the problem is before you can attempt to correct the issue. Your TCP/IP protocol may be corrupted also and that could indicate that there is malware of some kind on the PC which is breaking the ability to connect. Your PC assigns itself a non-routeable 169.254.x.x IP when the PC is not getting a DHCP Server supplied IP or when the DHCP Client on the PC is corrupted or infected.
You should Google the exact error message you get when trying to renew your IP address as a first step.--
Whats the point of owning a supercar if you cant scare yourself stupid from time to time?