I have NOD32 V4 installed, together with PrevX 3 Edge and defensewall 2.53. It happen many times that the HDD light is constantly on for about 5 minutes, and I cannot do anything on the PC. Sometimes, I have to turn the PC off with the power switch. And at the next boot, it stops at the login screen (Please wait message after logging in into my account), and nothing happen anymore. I have to boot multiple times before the PC work normal. I then uninstalled defensewall and everything is absolutely normal. To be sure, I reinstalled defensewall, and the problems came back, HDD permanent on, like something is accessing the HDD non-stop, so much that I cannot do anything on the PC. Uninstalling defensewall solved the issue right away. So it looks like that defensewall does not like to run together with prevx and nod32...? I am using Vista Ultimate 32 bit, with 4GB memory and a Q6660 processor. Does anybody observe something like I do or is it just me?