Hopefully, the following examples, will help you better understand your problem:
Code:
<p>Johnson & Johnson</p>
will cause error messages, because an ampersand is a special character in html files.
An ampersand on its own needs to be written as
&
Code:
<p>Johnson & Johnson</p>
You most likely ended up with this:
Code:
<p>Johnson &amp; Johnson</p>
This is valid, but most likely not what you wanted, because it'll be rendered as:
Code:
Johnson & Johnson
To fix this, simply search for
& followed by
amp; and replace it with a regular ampersand.