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i seriously doubt it came from XOOPS installation or we'd all be detecting a trojan..
trojans need to be downloaded and executed..
maybe 1 of the files in the mydownloads, what's been submitted may have a trojan.. but i can assure you 100% that the XOOPS files downloaded from this site are virus/trojan free!!
a little more info regarding the name of the trojan would be handy too, we could get info then on what trojan it is so that we can find out how it works..