When I open the Norton Internet Security window, Statistics show last virus scan performed Dec 5, 2011, and Days left in trial as Unknown. When I click Quick Scan, I get a message "The scan failed because of a scan engine problem. Run LiveUpdate to get the latest version. The basic NIS window shows "LiveUpdate occurred, Today at 3:06 AM." Attempting to run LiveUpdate again, to comply with the error message, nets no new downloads. Trying to run a Quick Scan again results in the same error message. I have an order confirmation email from Symantec. It appears that Live Update is working fine, but scans are not. What is wrong with my setup? What do I need to do to fix this? I am running Lion.