I just ran into this in the last couple of days at different clients who all have a SonicWALL router and run SonicWALL's Gateway Antivirus on the router. Whenever I tried to download the free CCleaner, I got a message in the browser that the download from Piriform was blocked because the download contained xpack.gen(trojan). I realize this is a false positive, but what a pain! Came to this forum because I was curious to see if anyone else was experiencing this same problem.