Re: CSI Dark Motive problem
I beat the game myself a while ago without any problem, but it seems that this first case is a pain in the ass for many many people, it's some kind of bug. Since you're still in the first case, give it another try starting from zero. The whole game is pretty good, the cases get more and more interesting.
I take thant you can't question Leslie Handleman, can you?
****SPOILERS FOR DARK MOTIVES*****
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In order to finish the case you should have 7 fingerprints, everytime you get a new one try to match it with the ones that you already had, even if you're sure they won't be a match. Compare each print with ALL the others. At the end, just before the end you should have 7. I guess you have the shear? Have you search on it for more fingerprints?
Anyway, now that I think about it, I know there's a patch for this game, maybe it will help you... to be tru I don't know what it fixes... It's available at ubisoft's web. Oh, and here you have a link for a pretty nice walkthrough, compare it what the others you tried.
Walkthrough