I think there are two different issues here:
1) avast detection of the file.
What do you mean by ‘Hotmail again killed the VNC file’. Does McAfee detect the file as being an infected one? You said that in the 2nd computer avast did not detect it but, after, it was detected as “Suspicious” (when the floppy was read)? Suspicious could only the attachment of the email (becouse of any reasons: extension, you did not add a Subject to it, etc. etc.).
2) File sharing and communication between two computers.
I don’t know too much to help you. Could be a problem of your VNC software, or even how Hotmail works with the file, or how is configurated the ‘email server’ to share the files, etc. Another point: how avast Home works in this kind of network.
[i]To ones that does not know, VNC (Virtual Network Computing) is a software that makes possible to view and fully-interact with one computer from any other computer or mobile device anywhere on the Internet. VNC software is cross-platform, allowing remote control between different types of computer. Any desktop can be controlled remotely from within a browser without having to install software.
Generally, VNC has a wide range of applications including system administration, IT support and helpdesks. It can also be used to support the mobile user, both for hot desking within the enterprise and also to provide remote access at home, or on the road. The system allows several connections to the same desktop, providing an invaluable tool for collaborative or shared working in the workplace or classroom. Computer support within the geographically spread family is an ever popular use.
The open source version of VNC has been freely available since 1998, and more than 20 million copies of the software have been downloaded. The software has also appeared on numerous magazine cover disks, and for several years all popular versions of Linux have included VNC. It is in active use by many millions in industry, commerce, education and at home. Virtually all Fortune 500 companies use VNC, and installations of VNC across thousands of workstations are commonplace.[/i]