A large part of the problem is that you appear to either be (incorrectly) quoting the error from memory or trying to paraphrase it; this is always a mistake. Either copy and paste the exact error into your email, or tell us that it's not a literal error.

If it's just a "File not found" error, that's a different animal altogether; "pp" is most likely not in your path, just as GrandFather said. Try using the Windows' "find" feature to figure out where it is - if it's there at all - and whether that folder is in your path. One thing that I've seen happen on occasion is that spaces in the directory names (something that's common in Windows) can create problems.

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Human history becomes more and more a race between education and catastrophe. -- HG Wells