Hi
Going from top to bottom:
Your logo looks very unprofessional and like it was created in 2 minutes. It needs to be either a vector-based image or change it altogether.
Your navigation needs a bit more careful thought: 3 buttons with loads of space at the top and 25 squares of navigation down the bottom?? Use a simple but organised navigation, then maybe you wouldn't need to open up telling people how to use your website, but instead telling them what you're about and what makes you different, etc.
Overall, your layout is in general very plain. Theres no splashes of colour or focal images. A bit of emphasis could draw attention to your latest offers and expiring soon boxes. Also there are horizontal scroll bars at 1024 x 768 resolution.
On a less important note, I'd say lose or limit the Google Ads.
Sorry to sound so negative, but there is scope for improvement.
HTH