I make powerpoint slides at home on my Powerbook. I drag and drop pics from the web into the slides and they work fine. However, when I put the slides on my thumb drive and load them on the PCs at work, all the pics fail to come up and I get this weird error message that I need Quicktime TIFF decompressor or something. I checked my Mac Powerpoint preferences and I am not compressing graphics. Any ideas as to why this is happening and what I can do about it? Thanks!