If you are getting a message that the fastfold.dll or PartyCommunicator.hm2 are a trojan/virus with the new release that is a false positive. The reason is we updated the files for this release and this often causes firewalls and antiviruses to be suspicious which is a good thing. We have submitted them to the most popular/common antivirus programs our customers use but it may take some time for them to be white-listed by those companies since we were in a rush to get this release out to you.
As long as you downloaded HM2 through the auto update or from a genuine link from one of our staff there is nothing to worry about. Add C:\Program Files (x86)\Holdem Manager 2\holdemamanager.exe to your exceptions as well as all the .dll files from the list above and tell it to ignore it if you get a warning. Normally within a day or two the security software companies will approve it and the issue will go away.
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