Hello. Yesterday I had a bit of a peculiar happenstance, and decided this morning to do an In-Depth analysis of my computer with NOD. I am running v2.7 for compatibility reasons, and cannot run the later versions. I am also running XP SP3. The In-Depth analysis progressed fine for a while, but at a midpoint along the scan, the scanner seemed to get 'stuck'. It was analyzing the same file for a long while, and CPU usage was pegged at 50%. Then, Windows Security Center popped up, telling me that no AntiVirus was installed on my computer! To be absolutely clear here: The security center made NO warning of this when the computer was started, or before the scan. It was only AFTER the scan was in progress that it made this warning. This leads me to believe some nasty program responded to the In-Depth analysis by crippling NOD32. When I rebooted the computer and rescanned in Safe-Mode, it found nothing. Rebooting into normal windows and re-running an In-Depth analysis progressed smoothly and found no infections, nor did it hang, nor did Windows Security Center pop up a warning. It seemed the second run through didn't have that problem. Should I regard this as a one-time fluke? Or is this to be regarded as something far more sinister, like a rootkit? Any advice would be appreciated. Thank you.