Fix OSCommerce admin panel

I need someone to do two things: 1. Fix OSCommerce site, it seems the admin panel is not working anymore. When I go to log in it shows a blank web page. 2. Install and configure the latest security updates for OSCommerce and any other related technology the website is using. I believe there might be a trojan installed on the website right now, you need to remove that and cleanup an other security issues the website may have. The website name is: [login to view URL]