Uninstall process should remove all NeT Firewall components; however I don’t exclude the collision. Please check the registry key below, if it exists then just remove it and reboot (this is kernel component registry key). If it is not then probably your problems are caused by something else.
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesipfrwl
Hope it helps…
P.S. I would be gratefull if you could explain the problems you’d expirienced with NeT Firewall.