I currently have version 9 on our network, but we don't have any users who have Vista yet. However, I have a PC here that I am testing so we can prepare for Vista on the network. I installed this version on the Vista machine and I got a message saying "Driver blocked due to incompatibility "Symantec TDI and NDIS Drivers is incompatible with this version of Windows." The question I have though is it appears the AV is working though.. I don't want it to leave any vulnerability though. What would you suggest? Do you know if there is a patch offered for this version of Symantec? I also want to mention that I have upgraded to version 11, I just don't want to try it yet because I am not sure how it will affect the users right now (not sure what I have to do to install for all users).