I'm sorry to hear that Flutist. The game is compatible with XP and all, right?
Did you try uninstalling Chemicus, deleting all your existing QuickTime and then reinstalling Chemicus?
I was just thinking that you said you had loaded Chemicus which may have brought up your existing QT and caused the program to continue running in the background. I don't know what else to advise, but to back clear out of this, delete your resident QT versions and then reload Chemicus, which should install the correct QT version.
I will forward the thread to Syd and Jenny1 though.
Love, WItchen =O)