What's in your .vimrc file?
ktf: I do a lot of copying/pasting from my browser (and other random places), so these mappings make my life easier:  " copy/paste with the system clipboard
  map ^P "+gP
  map ^C "+y

Also this, for dealing with DOS-style stuff:  " map <ctrl>+s to remove ^M from the ends of lines
  map ^S :%s\/^M\/\/g