Some thoughts - Seed I doubt that Macs are better protected from viri since they employ the same technology to write from memory to disk! I agree with you that an 'interupt' error could have knocked out the end of file or end of routine marker so the command could not fully execute - in memory - result endless disk activity untill all free space is filled. I also envy anyone with the Big Mac - yummmie - I love the graphics ability and have no doubt the newer ones leave the rest in the dust for multimedia apps.
BTW Real Audio has a big problem with Video drivers so I would double check copatibility issues where installs fail.