Can anyone help please. When I log off and close down my laptop, for a nano-second, something flashes up on the screen and all I can make out are the words "is dead" but there is a lot more script, but it all happens so quickly i am unable to read any more. I have run my anti-virus several times and nothing is being flagged up. There are no viruses detected and no threats. I have also run Windows Security and again no virus or threat is found. Sometime ago I recall hearing that a virus or threat can lie dormant on the computer waiting to be triggered off?

Can anyone offer any suggestions what this might be and how do I establish what kind of threat or menace it is and how I can get rid off it before any damage is done.

Any help or suggestions would be appreciated.

Many thanks