It looks like an encoding issue. Note that the page is set to render the code using the "Western=ISO-8859-1" character set, when it should be using UTF-8.
In the code for your template/theme (I forget what PHPNuke calls the thing now), look for the line:
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
and replace it with:
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
and you should be "good to go".
You can "review" the effects of this in FireFox by loading the page (it will have the garbage characters showing), then use the FireFox Menus "View->Character Encoding->Unicode (UTF-8)" setting to see the page rendered properly.
I used various flavors of PHPNuke years ago, but now use Joomla! for general "portal" stuff - it works "great", I think it is coded with higher quality, and it being available as a "one-click" install makes it a "breeze" even for non-technical folks on DreamHost.