"While the core ClamAV open source project has not
focused on desktop Windows installs, there is a separate project
called ClamWin that already provides ClamAV for Windows desktops.
However, the ClamWin project has some shortcomings: It does not
scan files on access. Instead, it needs to be run manually or at a
scheduled interval to scan a file or drive. The new ClamAV for
Windows solution from Sourcefire, on the other hand, will perform
"Additionally, ClamAV for Windows melds both the cloud and the
desktop, with one benefit being a reduced processing load on users'
systems. The solution relies on a desktop client that Watchinski
described as being lightweight and fast, and which connects to a
cloud service to do the heavy lifting."