vim cannot replace double quotes

Code:<p>This privacy policy (policy") will help you understand how thissite.com (us", we", our") uses and protects the data you provide to us when you visit and use thissite.com (website", service").</p>HTML needs the " replaced with &quot; so I have tried:

Code::%s/\"/&quot;/gand

Code::%s/"/&quot;/gBut I keep getting the error: Code:E486: Pattern not found: \" or Code:E486: Pattern not found "Why can it not find the pattern?