My Internal Pages are not working

Hi,
I would be very thankful to you on helping me in the following..

   Ii have a site developed with oscommerce.   www.andrejewelrycollection.com

    In this we changed the hosting server last week..

    I found that now the internal pages are not working fine..

    In this website we are using Php pages too..
    These PHP pages are working fine..

    But the oscommerce pages are not working fine..

While opening it shows not found error..
    would u plz help me?


Regards,
Kathir