Removing the bullet points

You can’t without also removing all of the bullets associated with every other bulleted list in your site. You need to create a custom template for this page and ensure that you give it a unique additional class. Something along the lines of changing:

<div id="content" class="narrowcolumn">

to

<div id="content" class="narrowcolumn the-archive">

http://codex.wordpress.org/Pages#Creating_Your_Own_Page_Templates
Once that’s complete and the new template has been assigned to your Archives page, you should then be able to add the following to the bottom of your stylehseet:

.the-archive ul li {list-style:none;}