Hi everyone,
I am working with a client who is using Windows 7 with AVG free edition turned on.
Microsoft Office 2007 is being run with POP3 for emails to download from a local email hosting service. (nisa.net)
This has been set up recently (within the past week)

Recently the computer has received malware and a Trojan virus. We're not sure if it came from Flash or if it's something to do with email?
Hoping to not have to reformat as a lot of time was put in to getting the new email settings set up. Do you have any pointers for fixing this?

Thanks,