Maybe this was just a typo in your question, but it looks like you have the opening search tag listed twice.
{exp:search:search_results switch="resultRowOne|resultRowTwo"}
<table border="0" cellpadding="6" cellspacing="1" width="100%">
{exp:search:search_results switch="resultRowOne|resultRowTwo"}
Also, the excerpt tag by default allows 50 characters. You can also consider the character limiter plugin (http://devot-ee.com/add-ons/character-limiter) which is a free plugin from Ellis Lab. Once you have that setup, you would use it like so....
{exp:char_limit total="200" exact="no"}{your_text_field}{/exp:char_limit}