I have Norton Security on my computer desktop and my two laptops but I keep getting a message saying not switched on so I click it and click switch on but nothing happens, and it says I have not got it on my computer desktop, but I purchased and downloaded it on all of them and it says I have over 200 days remaining left on my three computers and that it is up to date so why am I getting this message all the time, and why does it say cannot find any antivirus on my desktop computer