Vim Pasting

I recently had problems pasting text into Vim by the traditional
RIGHT click method. Vim would enter Insert(VISUAL) mode instead.

One solution when using Putty is to use its own mechanism :

SHIFT+INS

I prefer to use RIGHT click, as it's more natural so I found the
solution is to add

set mouse-=a

to ~/.vimrc

This solves the problem, and I don't need to use nano when editing
text files on my remote server via SSH using Putty.