I tend to use Microsoft
Word macros a lot when dealing with HTML documents. If you don't know how to use Microsoft Word macros, you can use Microsoft Word's Find and Replace instead.
Find
\<style*\/style\> and replace with nothing. This will delete all of the
<style> elements in your HTML document. Remember to check the "Use Wildcards" box before running Find and Replace.
You can also use TextPad or any other text editor that understands REGEX.
P.S.
I'm assuming that your HTML document contains the
<style> element and not
<styles>