What proof do you want? A chimpanzee turning into a human in three generations?
Nahhh, take as many generations as you want!
About viruses -- there is debate as to whether they are actually living organisms or not.
So I would rather you showed me a beneficial mutation in a multicelled organism. Beneficial for evolution, by the way, -- one yielding an increase in metabolic activity of any kind. I don't think you will find one.
But it is precisely this that evolution needs. Which cell has produced and used a de novo protein? Which variation in an existing population has yielded a new form or function?
Give me something as a real example that does not simply exist in the imaginations of evolution believers.