Vim 7.2.411 won't work on CentOS 2.6.32-504.3.3.el6.x86_64

Hello,
I install Vim on CentOS with command # yum install vim.
This works, but then running vim gives error:

[root@centos public_html]# vim contactus.html
Error detected while processing /etc/vimrc:
line 50:
E484: Can't open file /usr/share/vim/syntax/syntax.vim
Press ENTER or type command to continue

The Vim file opens in green, rather than the usual colours I prefer to view code.

Vimdiff has the same problem, as well as being unable to edit a file.

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