Hi skynetwork2010
This issue related to limited memory set on your server or host.
AbanteCart in default php.ini is setting memory to 64M.
See php.ini file:
memory_limit = 64M;
Try to increase the memory to 64M or more.
You can read article below with instructions how to increase memory different ways. It is for Drupal, but the concept is the same
http://drupal.org/node/207036