I'm putting antivirus software on Windows 7 computers in the middle of Africa. The computers don't have internet access, but still need to be protected against viruses from CDs and thumbdrives. Separate from these computers is one computer that does have extremely spotty internet access.

What's the best AV software for this situation? The important part, as I see it, is that we need to keep the computers up to date, but can't let the AV software suck down updates at its leisure: the computers are disconnected, and getting emails onto the connected computer is a challenge enough.

We thought we might transfer update files to the connected computer using a protocol that can handle repeated connection drops (e.g. FTP with resume.) Then we'd manually apply the update files to the disconnected computers.

Does any AV software support this? Is there a better solution?