Tversity & Playstation 3

Hi, I just bought the BitDefender Total Security 2008. My friend told me to buy it. So, I have this problem. I have TVersity installed in my primary computer & I also have a PS3. I used to have Trend Micro PC-Cillin Total Security. But now, I can't stream my movies, music & pictures. There's a pop-up box showing me that the port (192.168.2.61) has been blocked by portscan. This happens everytime I try to play a movie or music. If I disable stealth mode, it works perfectly. It streams well, but I'm afraid if something happens to my primary computer if I disable Stealth Mode.