After a windows update my Norton went so I uninstalled it so I could reinstall it. I can't reinstall...it just runs me in circles after initialization. When I click install I get a message saying computer was cleaned up during initialization and to restart....download and save nsbu.exe file, open file and try again. This goes on and on. It also tells me there is another install manager running in background and to wait until it stops or try to install again. This install manager message happens from the 1st try and continues if I wait an hour or until next day. I'm at my wits end and can't use the computer, especially for business purposes, without some kind of security. Has anyone ever run into a problem like this or have any ideas about what to do. A comcast tech even walked me through it on the phone but the same thing just kept happening. When I finally realized he had no ideas left and didn't know what to do I ended the call and told him I'd continue trying on my own.