“Single” page doesn’t validate

Ok, so I am fairly new to wordpress, but not web development. Anyway, I created a custom theme and all is well, except my “single” page(individual article view) doesn’t validate. I get the following message when I try to validate with W3C:
“Sorry, I am unable to validate this document because on line 100 it contained one or more bytes that I cannot interpret as utf-8 (in other words, the bytes found are not valid values in the specified Character Encoding). Please check both the content of the file and the character encoding indication.

The error was: utf8 “\x94″ does not map to Unicode”

The error goes away when I remove this function call:
<?php comments_template(); ?>

Which would be fine except I need that to receive comments.

Here is an example post:
https://www.chrisestelle.com/blog/?p=13

Any ideas??

Any help is appreciated!! THANKS!! caestelle