Read the last few pages. Your systems are infected. Google safe browsing has given the forums a clean bill of health since July 30:
http://www.google.com/safebrowsing/diagnostic?site=forum.juventuz.com
So if you're seeing a problem now, it's likely something lurking in your hidden folders. Meanwhile, there is evidence that something funny has cropped up on the forums in the past, even if there's no evidence of it right now. Since it's happened before, that's just more reason for you to be running malware scanning software on your own systems and do the safe thing. Do note that you could effectively have your system infected by another Web site and yet get the warning for the Tuz forums, even if the forums have nothing to do with the infection.