In the past thirty days I've installed two updates to Parallels 9 on my iMac Running (OS X) plus updates to windows 8.1. With each update and at other times also, my Avast Antivirus states that it has detected and quarantined Dead-B Virus. The specific file quarantined is users/shared/parallels/windows 8.pvm. I have had 6 specific detections and quarantines since March 26. Is this and accurate detection? Is this file required for Parallels to run correctly? I do not see any degradation in my parallels or windows performance.