Magento File restoration and Server Examination

Magento File restoration and Server Examination Our Magento website based on CE.V 1.7.0.2. need expert for Handle malware and suspicious script,and tighten and arrange [login to view URL] Check and configure of the Magento and Apache logs for system / php errors relating to the [login to view URL] list possible modules that might influence the checkout or [login to view URL] a technical analysis of requirements -Take backup ( as on dtd.15.5.2015) of org files, replaced all files with a backup copy and fixing file errors,malware and suspicious script, and further tighten and arrange security. Checking and rectify Blue host VPS Server settings as per Requirements of Magento website installation. By completing above mentioned job,need to solve the stated problems "" Currently, as on dt 30.5.2015 server was scripted by suspicious file and after that a server administrator worked on it and he removed some suspicious file,Now, facing a problems as -""After customer selecting the product toward step 1 (checkout Method) to step 6 (Order review) in between steps 2,3,4,5 and 6 its randomly and repeatedly reverse back to product checkout page or taking longer loading time to move next steps. customers are unable to place orders,(sometimes they are successful or sometimes failed to placed the order."",If you interest about the job,then please inform about your approach towards the job and cost,