We received a new notebook from our grandson and we notice a few times when we turned off the notebook, we saw this notice just before the screen went black: "R6025 pure function virtual cell." It remained for about a second and then it disappeared quickly and machine turned off. We didn't know what it referred to. (That notebook has WinXPsp2, IE6, AdAware and Norton Internet Security 2005.) However, tonight my husband was using our older notebook and he saw the following message when closing down the system: ""Runtime error symantec R6025 pure function virtual cell." After a second or two the notebook turned off. (This notebook has WinXPsp2, IE6, AdAware and Norton AntiVirus and Norton Firewall 2004) What could be causing this? Does anyone know if both are related to Norton? The first one (on new notebook) did not mention Symantec. What we did remember was that we had just performed an AdAware and Norton scan on both machines prior to this notice showing up. We saw the message on new notebook only a few times and just once today on our older notebook. We are senior citizens and really do not know what is going on as we are not computer knowlegeable. Please remember that this only happens when we are turning the notebooks off. Thanks for any help.