You probably have the older version still installed, and it's before the newer one in your path. I would suggest a where command, but I've yet to see a win port of that. I guess you could just do a search for perl.exe and figure out where the older version is, and uninstall it. Unless of course this is a system you don't have full control over, in which case you'll just have to use the full path of the new one to call it...