Well, first off, it keeps happening because you're on a PC, but that's another story altogether, I think. =) Frankly, this is a shining example of why computer engineers are not users: these enigmatic error messages that no doubt mean something to somebody, but few people I know. And it's no better on a Mac these days -- we get the all-purpose "error type 1" message, which usually means a conflict with something, somewhere, but no idea what and no idea how to fix it save go through some absurd, time-intensive testing of the extensions. Chances are it's something to do with your .rsr file. Try deleting that and starting afresh: Poser will rebuild your .rsr file for you, and maybe this time it'll get it right. =)