I'd be inclined to not delete any of these keys. Some of them are quite likely valid keys to do with the internet connection, that have had their values changed by the net limiter program. If there is (was) and option in that program to "enable/disable" settings applied, it would be worthwhile re-installing it, disabling its settings and then uninstalling it.
There are also a few "optimisers" around to improve (or allegedly improve) connection. (Most of these just make sure the TCP etc settings are optimised for your internet speed) Try
TCP Optimizeror
Advanced Windows Care