It really shouldn't have to "renew" the IP unless for whatever reason DHCP is completely hosed in your configuration somewhere. I know that my ISP gives me DHCP leases of 24 hours at a time, but since i never turn off my gateway computer, it keeps renewing them. If you type ipconfig /all does it give you any relevant information?
If you can, maybe one output of ipconfig /all working normally, then one when it's broken for comparison's sake?
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