Just got the stupid Met Police banner on my computer. No icons, just a banner saying that you are fined £100 for viewing illegal content. Site I was on was You Tube.
Norton did NOT detect it when it was dumped on my PC. Not impressed with this at all.
Got rid of it by booting into Safe Mode and restoring the PC to a previous Restore Point ( 1 week ago so not a problem)
http://deletemalware.blogspot.co.uk/2011/06/remove-metropolitan-police-ransomware.html
Removal instructions are above. This started in Germany in 2011 so Norton should know about it.
My Norton Antivirus says it is right up to date.
Can't get through to Norton to give them feedback - anyone got an email/telephone number for feedback. Online form for feedback says that you will NOT get a reply to feedback comments.
By the way I am a retired computer engineer with MCP and MCSE qualifications.