RyuZU said:
I disabled DHCP on windows, but for now I'll leave it aside, utorrent too, I'll wait a few days and try again, but thanks for trying to help me and for your time, anything I come back here.

The port 2000 is open, I think it has always been, I haven't tested it yet.
That would suggest your problem is either your ISP or a second firewall installed on your system. 2000 is a port that is commonly open by default in firewalls. It's used by certain VoIP technologies. But if it's open for you with just DMZ (no port forwarding rules) and you don't use any VoIP software on your computer specifically, then you must not have anything that's using it. In that case, go ahead and use that port.

Once you have it working, I suggest specifically forwarding port 2000 to your computer and turning off DMZ.

Also, in the IPv4 settings on your computer, the subnet mask should be 255.255.255.0.