CRE Loaded Cleanup and Improvements

( for PART 1) Our shopping cart is CRE loaded.? I believe the version is 6.1.? Our shopping cart and website keeps getting infultrated by viruses and affects several pages on our website.? I hire designers to clean it up, but the viruses keep coming back.? I am not sure if it's due to a blog issue or our vulnerability in our shopping cart.? The virus places code on our web pages which direct traffic away from our site.? It also affects the CAPTCHA security code from being displayed on our site. I need the virus cleaned up and I need the designer to either update our shopping cart of blog and figure out where the virus is possibly coming from. (PART 2) We have a custom registry which is similar to a wish list that allows users to add items to a list and allows other people to buy them.? It's great baby gifts so people can add all the items they want and send people to the registry to have them bought.? Our registry is coded in PHP and works with a my SQL database.? We need to the designer fix the registry so that when items are purchased it deducts the products from the regsistry so items are not purchased multiple times.