Morning Yeh you are bang on here I think, i tried switching to 32 bit AS on my win7 64bit thinking that could resolve, but then discovered the issue. The Math::Pari module also appears to struggle with the much newer versions of Pari/GS, because its so old It doesnt seem to realise that the version from the web IS up to date and tries to patch it anyway? Strawberry perl has installed the troublesome module now , i haven't tested it yet though. Whilst sorry if im being ungrateful, but I still think a little be of info on the CPAN page might save alot of pain for others. Also im baffled as to why the install script carry s on when its clearly missing a vital dependency. PPM is awesome, no failures yet btw