I have tried NIS 2010, NIS 2009, and am having the same problem. This is not a virus. I have done a clean installation of windows and redownloaded Norton. First, it will after a while, give me (in 2010 terms) error Module:3039,Error:1 and I would notice that SONAR was turned off. It would not turn on until the computer was restarted and then it would be on automatically. This started last saturday after nearly a month of no problems. I am guessing it came in some updates. Lastly, I decided to look deeper and found Tamper Protection Settings off. In NIS 2010 I kept on getting an error and never got it turned on. In 2009 it would be on be default but it got shut off the first time I the SONAR got turned off. NIS 2009 is working fine on the Windows 7 RC x86 on my Dad’s computer though and I don’t know that my sister is getting any problems either (in XP Pro sp3). I decided to try the 360 v4.0 beta and it has the same SONAR problem. I’ve loved norton so far, but cannot stand this. I will save all my passwords out of Identity safe and use McAfee until Symantec fixes this problem.