strange title I know. My uncle aged about 80yrs been in computer related employment most of his working life including the development of the first commercial hovercraft. He says that he does not use antivirus as he knows what they are and just deletes them. Possible? or senile dementure?
If you delete all unexpected or suspicious e-mails there's a fair chance you won't get infected via e-mail. This won't stop you getting infected by things like Sasser worm, or by trojans that download silently from websites.
I think it is a very short-sighted attitude and he ought to get click here
I wouldn't go as far as 'senile dementure'. The thing is that viruses are ver commonly tricky litte things. A good portion of them write to the registry with various keys making removing them very awkward and time consuming to remove.
Then there are viruses that modify files, sometimes system files, making them all the more difficult to remove. Then there are viruses that sit in your hard-drives MBR which are a real pain to get rid of.
So it isn't actually possible to "just delete them" - but it is infact a, sometimes, tedious task to do it manually. Best to just use anti-virus as this will mostly stop you becoming infected in the first place, and then if you do become infected they can generally remove the virus themselves.