If you want your page to behave properly you really need to work on fixing invalidations as i pointed out before in a previous thread relating to your HTML markup...
You also have numerous CSS invalidations to.
See here.
I'd also strongly suggest changing your main background, it's 12mb, that's 4 minutes on a dial-up connection just to download the background image alone. If you must use that image, then look at optimising the image...
You would benefit hugely from spending some time in learning more on HTML and CSS, and with such clever and easy to use sites like http://www.w3schools.com/ there's not really any reason to not be learning how code correctly (or better).
Regarding the bullet, ensure you set list-style to none for both the list items and the list element itself... eg. UL and LI, not just the LI...
If the element looked like this..
<ul class="example">
<li>Some item</li>
<li>Some other item</li>
</ul>
Then you might use..
.example,
.example li {
list-style:none inside;
}