Just advertising a website via AdWords is not enough. You have to make sure of many things...
1. Is your website appealing to visitors.
2. What's the bounce rate?
3. Other ad's on the site, distractions?
4. Best to monitor the website with live chat so you can see the impact of the ad's, where they are going and doing. I use a great one that tells me many things at once.
5. Returning visits, do they come back?
6. Loading times, images and quality.
7. What is your competition doing.. use
SpyFu to see.
What is the url? PM it to me if you like. Maybe there're are some unknown issues.