How do I remove a virus from my site without knowing how to change the code?

My hosting company has deactivated my site due to a virus. They sent me an email listing all of the infected code I need to change in order to fix it (they scanned it for me). I don't know how to change the code and am afraid I will delete something I shouldn't. Is there any easy way to do this? Perhaps a plug-in that will do it for me? Any help you can lend?

Thank you!
Wendy