Hi, need help. Last night mn went offline & so I left my laptop alone (switched off). This morning I boot up as usual to read the newspapers/mn etc only to find my laptop says 'mn is not correctly configured. There is no system_identifiers entry to match this scenario' wtf does that mean? Why can't I open mn? It works ok on my phone. I also note that my security icon has disappeared over night so I can't click it to run a scan. I know nothing at all about computers, can anyone help?