Actually, this might no be so strange. A thread from around the time SP1 went final determined (I think Epyx did it) that the 'PCFKW' serial was not the second blacklisted key since the product ID after installation with this key did not match the one given by M$. So, if its not blacklisted it should work fine to install SP1 (but I would still stay away from M$'s windows update site).
Tomboy
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