Subject: have viruses developed naturally or is there any kind human interference

i asked the same question from biology school teacher. she said that viruses 
are connecting link between living and non living things. i don't belive her 
because if it was so than viruses should have been free living (i mean they 
should not have been parasitic) and should have evolved after their host.
another thing which forces me to think about the question is their diversity 
and their organism specificity ( some of them attack only a particular type of 
organisms) this type diversity development could not be found in viruses which 
are in another organism just to replicate and is rock-dead outside.
secondly, they have such a complex protein structure and their genetic 
material injecting mechanism is something which can't be developed without 
evolution.
another thing is they have a protein code and dna/rna only and no interaction 
between them so how can the genetic material get the coding of its protein 
coat.
this makes me feel as if the protein coat and the genetic material were 
synthesised differently and then combined to make virus.

please send me the date etc of oldest found virus fossil.

Re: have viruses developed naturally or is there any kind human interference