Why my website is showing junk characters?
When we remove � manually, we see:

&lt;h3&gt;Comments&lt;/h3&gt; &lt;table&gt;&lt;tr bgcolor='#E7E7EF'&gt;&lt;td&gt;Posted On: 12-13-2010


Probably it comes from comment.tpl.php in your theme. At first glance looks like UTF-8 - UTF-16 issue, but only you can really debug that.

The exact part of code you pasted seems to appear in following threads:


https://www.drupal.org/node/76407
https://www.drupal.org/node/28016


See, maybe original developer was using them? Hope it helps you with debugging, we here cen't really help more.