Unless there has been some damage to your OS, you've probably managed to install some malware on your system (which could also have done some damage to your OS). I suggest a full system scan with a good antivirus program is in order.

PS: Since this is a Windows issue, not a Word issue, I've moved your post to the Windows forum.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Dear Macropod,

Thank you for your advice.

Unfortunately, after running a complete System scan with Norton and restart, the aggressive message disappeared for a while, but it came back.

Kind regards.