I had faced an issue in some of my Windows 7 PCs. After allocation of manual IP Address also, some of the PCs are getting APIPA and those saying DHCP is enabled. To avoid this I followed the following steps.
1. Open the cmd with Administrative Rights
2. Run the command netsh interface ipv4 show inter at command prompt
It will show the interfaces of your PC. One will be loopback adapter and other will be the NIC card of your PC. Kindly note down the Idx number of the Local Area Connection. In the next step we have to fix this number to the Local area connection.
3. Run the command netsh interface ipv4 set interface <idx number> dadtransmit = 0 store = persistent at command prompt.
4. Go to services.msc and disable the DHCP client service.
5. Restart the machine and now the problem is sovled.
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