OK, I've got some progress.
I used a file wwdc.exe (Windows Worms Doors Cleaner) to close some ports (445, 135, 137, 138 and 139).
Some of the ports appear to be NetBIOS (Whatever that might be, my knowledge is limited).
I went to the device manager and start netbt.sys, rebooted and DHCP Client is back up.
What I want to know is is there a way to close 137, 138 and 139 without disabling the "NetBios over Tcpip" device? Or some other thing... Whatever, just make it work, please. D: