Thread:Extension talk:ConfirmEdit/Sorry but in locale (xampp, vista) confirmEdit doesn't show anything/reply

And how about configuring the triggering? Did you do that? See Extension:ConfirmEdit. Note that under the default configuration you have to do test edits with a normal user account, not your sysop user account, to see a captcha. You should also see a captcha when you go to register a new account though.