Hi, I have come to this forum after contacting both Acer and Microsoft. In the case of Acer I got the short sharp shift and very snooty about it too. Microsoft, the call was free but the help wasn't. And I thought if the people here can't help me then no one can! I recently bought a second hand Acer Aspire 5633 ( Ebay ) sans H/D and with a Power jack fault. The actual comp was in mint condition. Because the H/D was missing the seller threw in an unused Acer Vista upgrade disc set. I stripped the laptop down and repaired the PJ prob and installed a H/D . I then did a trial install ( i.e. no product key entry ) of the Vista disc ( reason: the discs had been kept face to face and the surfaces appeared slightly pitted ) the install was faultless. I then went to activate it online but when I entered the Product key it was refused , Message was, this appears to be an invalid key. I have several genuine Vista discs with Product keys so I just used one of them to validate the install. My question is has anybody seen this type of thing before and if so has an answer for me ? Is it possible this is out of date. cheers, Eddie.