Well first things first the ads need to go. If your serious about running a business you need to get rid of the ads and put your products on the main page, As in images and prices.
The google ads on the main page is a definate turn off to your site. Also the affiliate banner at the bottom pretty much kills your site altogether. No one is going to take you site serious untill you put more effort into it.
I mean for gods sake you got links right on the top of your main page leading your customers away from your site to other sites that are better laid out and have more products then you do. And to top it off they sell the same kind of products too. That right there is enough to completely kill your sites reputation before someone spends 1 min on the main page.
Try using these sites as an example of a good store.
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These sites are direct to the point and dont have any other garbage on them. Are you using some kind of free hosting service. If you are then get rid of it and goto Link hidden: Login to view and spend a few dollars and build a real site.
Thats about the best info I can give you. If your serious about your buisness then you need to spend a little extra and take alot of time in creating your site.