Hey, I have been getting these popup windows (even when no browsers are on!) saying, windows at risk and they direct me to a site to get updates (yes i know, i shouldn't ever click on them) but i don't know why this is happening. Could someone help me stop this? Moreover, AVG detects virusses in my Windows/System 32 folder called '.backdoortrojan' or something like that. i have tried to heal them or move them to the vault, but once in two days, there is another detection from the same folder, but another file. i only claim to know the very basics of computers, and nothing beyond that, and i hope someone from this community will try to help.