I just recently upgraded to version 4 and am having an issue. With version 3 when I plugged in a flash drive, or another hard drive, if it had a rootkit on it, NOD would immediately pop up warning me of it and remove it. Since version 4 I do not get this, and one hard drive I know has a rootkit it wouldnt even detect it. Is there something I need to turn on? If not, is there an option to manually update definitions with version 3? I had rather go back to that if possible. I liked the scan interface much better.