Good info! From reading the OP's question a couple of times, I suspect the OP has the misunderstanding that a different #!path_to_perl is required under Windows. It is not.

If this is the case, then I recommend using the GUI as outlined in my post to "set the Windows stuff once and forget it".

As an additional note: "hey, grep isn't a Windows command!"...just install a gnu version. I use this one: GNU Grep 2.5.4 for Windows. There is a single step installer that works fine.