Hi,
you need to upload your mambo files to the root (so that you see modules, components, administrator, .... folders in your root) and the point your browser to
http://www.perantivirus.com/index.php.

Make sure you backup your current site before as there already is a site running in your root. Best would be to remove it before.
You could also redirect your root to your mambo site using a simple index.htm in your root with this line in the header
Code:
<META http-equiv="refresh" content="5; URL=http://www.perantivirus.com/ezine/">
HTH,
Chris