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The best way to disable DCOM is in the registry. Click Start -> Run and type 'regedit'. Select HKEY_LOCAL_MACHINE -> Software -> Microsoft -> OLE. Change the key EnableDCOM from having a value of Y to having a value of N. Reboot your maching and issue the 'netstat -an' command again. TCP port 135 should not show up.
Perhaps reverse this? You may have to reverse all the security measures and then apply one-by-one to see where it stops. My understanding of NetBT is that to disable it you need to stop the server and messenger services. I suspect that one or both are not actively running and that might be why you are running into issues. If you have disabled the DCOM that might also be interferring with it.