|Are we to conclude that initially you had no anti-virus protection, then you installed/ran Norton, but subsequently disabled it and now are not protected again?|
If, after a "fresh" XP installation, Norton found a number of viruses/trojans, it suggests that this was either an "in-place" installation or a repair installation (no formatting involved)... is that correct?
As an aside: using torrents is not to be trifled with. There are numerous hazards and these must be well-understood and dealt with. It seems not to be the case here.