OSCommerce Broken

I Have an oscommerce based website that has two problems. 1) When you click checkout the system hangs at login.php+osc sid 2) Each time you create a new product there is an error, and it creates the wrong product I do not have time to fix this problem myself else i would. OSC has a purchase without account modification which i think may be causing first second problem. I need this done ASAP preferably today. The 1st problem is stopping users from putting though transactions, rendering the site almost useless.