Continual Forum Trojan Help Requests

These almost constant pleas for help about the recent trojans including the FBI, various UK Police, and the zeroaccess variety..

 

Where are they coming from?

 

Is it dodgy emails, of which I always delete without reading if I don'r recognise the sender or the title looks suspicious?

 

I, like many others, do some 'surfing' and I've never, yet, been hit by a driveby download.

 

With the number of problems that Quads is going above and beyond the call of duty to fix, is there no way of detecting how and where ?