I have three XP-Pro machines, all with latest updates. I have installed Nikon Picture Project successfully on two of them. On the third machine a box pops up entitled ClvActv, contents say 'Initialize file not found'. I am using the manufacturer's CD. I have searched the web for ClvActv and it does not appear to exist anywhere (except on my machine). I have contacted Nikon and Microsoft and neither have any suggestions. If any geniuses out there could enlighten me I would be ever so grateful. Many thanks JohnG