How can I change my static ip to dynamic ip, some say i have to install a dhcp server

How can I change my static ip to dynamic ip, some say i have to install a dhcp server

I am using vista, i have a static ip address whenever i turn off my modem. Some say i need to install a DHCP.I can see how to change ip address if i am on a dynamic ip but how do i do it with static ip.

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