[Plugin WP e commerce] cannot access wp-admin

my web: carikesini.com have been hacked last week (deface)

and then, i use restore facility from my hosting provider and i restored my web into 1 month ago setting.

the web already live again,

but i cannot access the wp-admin dashboard and the message that showed up are:

Warning: require_once(/home/k6284136/public_html/wp-content/plugins/wp-e-commerce/wpsc-admin/includes/display-items-functions.php): failed to open stream: No such file or directory in /home/k6284136/public_html/wp-content/plugins/wp-e-commerce/wpsc-admin/admin.php on line 15

Fatal error: require_once(): Failed opening required ‘/home/k6284136/public_html/wp-content/plugins/wp-e-commerce/wpsc-admin/includes/display-items-functions.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/k6284136/public_html/wp-content/plugins/wp-e-commerce/wpsc-admin/admin.php on line 15

is there anyone who have solution for my problem?