with all do respect to the last poster. Screen res is the last of your worries right now.
You need a better, more professional design yes of course.
But you must always focus on conversion. Make sure you have a good stats program with your cpanel. Something like awstats works well. Make slight changes to your enrty page to determine what factors your visitor react to in a positive way.
Set conversion goals so you don't get discouraged. Mybe like 1:100 or 1:1000 if need be.
Just be sure to cater your site to offer an incredible product and or service then offer something even better.... Always 'supercharge' your offers and your conversion rate will climb.