how many VIMs do i need

I've just installed Redhat Linux 5.2 and during the installation I selected
vim-color
vim-common
vim-enhanced
vim-minimal

and I still can't get vim/vi to display colour in a .c file.

Which of these don't I need and how do I activate the use of color ?  I've tried  :set 
syntax  as I was told this would do it, but it hasn't.



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