I installed Service Pack 2 and everything is fine. Here is what I did. I have Vista 64 Home Premium. 1. I upgraded NOD32 Antivirus to 4.0.437.0 2. I unchecked (disabled) Anti-Stealth technology and Self-defense from within Advanced setup from the Antivirus and antispyware screen 3. I did not reboot 4. I installed Service Pack 2 from Windows Update 5. Once the Service Pack installed and I was able to log in I checked (enabled) Anti-Stealth technology 6. I rebooted 7. Upon log in I checked (enabled) Self-defense 8. I rebooted 9. Everything came up fine and NOD32 is green and no BSOD's I don't know if my procedure had anything to do with anything but it worked for me.