router problem

[tigerx]

i have this problem for a while now, basically, my ISP, which is Rogers, change my IP very very very often, and my router somehow's not picking it up, and i have 2 other computer hook up to it but they work fine, just this main computer never get the IP automatically, i've already set it up to Dynamic IP, but i have to manually get the new ip, myself .

my router is a D-Link DI-604.