Can someone please direct me in the right direction with this error.... Installation seemed to go smoothly up to the point of accessing the VM to install Windows XP. I receive the following message: Configuration File /Users/amghost1/Library/Parallels/winxp.1/winxp.1.pvs is already used by another instance of Parallels Desktop. Do you want to override a lock and open file anyway? Any attempt I make to continue is met by an activation screen. When I activate (again) it says successful, but then forces a restart of the machine. I cannot seem to get past this point. Any assistance is greatly appreciated.