Over the last year, a number of virus and fraudulent autodialer packages have been put up on the net pretending to be desirable files. But, since you are on a Mac, there is no real cause for concern about viruses. As to upload activity starting slowly, we are in the realm of complete speculation since you still have not given any substantive information. If you are a completely new Limewire user, it can take Gnutella a little time to notice you. This may be because you do not have many files for sharing, and those that you have are very popular and readily available elsewhere. The ultrapeers keep records including the length of time you are on-line. If you are only linked for ten minutes every week, there will be little point in others starting to download from you, etc, etc, etc. All this in addition to the questions I posed last time which you have also ignored.