Well, I had the same problem a couple days ago, and caught by my avast! scanner, and I was unable to continue to play. The xtrapva.dll file is for the online hacker prevention tool.
I was forced to uninstall. Too bad, because otherwise the game is…
I found one as well, in a dll file, but thought it was a different name. I quarantined the file and continued, and did a file check upon completion, and have not had any more virus alerts.