I'm currently testing the free version of COMODO Internet Security version: 3.13.126709.581 and its been a week since its installed on my PC: Windows XP SP2; 128 Mb VRam; 512 Mb Ram. As of this moment it doesn't give any problems and updating is not a problem & virus detection is good. It is able to detect unwanted programs that NOD failed to detect. Temporarily, I shut off my NOD 32 Antivirus/Antispyware.