custom oscommerce overhaul(repost)

complete overhaul of a **custom** script oscommerce install is required. the version needs to be updated from? osCommerce 2.2-MS2 to 2.2-RC2 please see the site here:? [login to view URL] the install has been neglected and needs to be fully reinstalled and cleaned up. it has many errors and problems: - not sending emails properly - fails to communicate with sendmail - not sending order confirmations - not logging new orders - custom one page checkout needs to be fixed - when customers login via one page checkout about 50items are randomly added to the shopping cart - various little errors overall it needs a fresh install and then needs the template and one page checkout setup again.? please understand that we may find more issues while we go through this, that is why i am saying it is a complete overhaul