The last few days I have noticed what seems to be a problem with downloading virus updates. I click -update everything now - the download runs and 57.8 mb are downloaded and installed. I checked the detail on the updates and they are the same files everyday. My mac software is 10.5.8 leopard, that was updated from an early version of tiger 10.4. I do not have the hardware which made mac compatible with microsoft programs found in later versions of tiger and leopard.