FEATURED: Changing The DHCP Lease Time in Windows
Your router can assign local IP’s to your PC manually using the DHCP feature. It is possible to change the lease time of your DHCP so that your router will only assign a new IP every X hours.
So your router supports DHCP and you want to know how to enable DHCP in Windows 7? DHCP is actually enabled by default, because all modern routers nowadays support DHCP, but if your configuration is messed up somehow, you still might want to check it.