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I have it running on Win7, the only thing it needed was
to get the USB device drivers from the HPTuners website.
They're not famous enough to have Microsoft native
support.
34, started using when I was 27 or so. Should work fine on win 7 as long as you are using the 2.22 version we posted in our help section of our forum(the beta software works fine on win 7 as well)