Secure Web Files - Remove Errors from Web Hosting Account

We have wordpress inslalled on all our sites on iPage shared hosting. Recently, there have been large number of infected files found on the wordpress installation causing the sites to be pulled down till the infected files are removed. We need the person hired to do the following: 1. Take care of the errors, remove them and then contact iPage again to get our sites back. We dont have much of a backup, so taking care of this without losing the data is important. Also remove the source of these error and please show us the log after running the websites after running through known website security tools to ensure this has been completely taken care of. 2. Tell us what needs to be done in the future to prevent such hacks in the future, that is expalin the possible reason that this might have happend. I have attached the file of errors. 99% of them are of the type known malicious file; matched malware: JCDEF Obfus CreateFunc Back Door Eval please note that once hired, this job needs to be commenced asap and finished very quickly, within 12 hours. We cant have waiting period.