opam config env registry issues

[camlspotter]

I see 3 or 4 complaints in Twitter about opam config env running for each starts of Command prompt. Some annoyed the registry for the auto-execution of opam command is never removed even after OCaml is uninstalled. These ppl never report their problems, and never return to OCaml again :-(

I am sorry but I cannot give any more details since I do not use this installer.