installed MacOS 10.13 update. Parallels 11 wouldn't boot Windows 10 BootCamp, which previously ran without problems. Windows 10 BootCamp runs fine under BootCamp via Macbook restart. Upgraded to Parallels 13.1.1 (43120) Won't boot Windows 10 BootCamp. boot Parallels, My Boot Camp launches: drop-down says "The specified file cannot be used as a virtual hard disk. Please specify another file. [OK]" OK dismisses drop-down new drop-down says "Unable to connet to Hard Disk 1. A file or device required for the operation of Hard Disk 1 does not exist or is used by another process, or you have no permission to access it. The virtual machine will continue running, but the device will be disconnected." [OK] OK dismisses drop-down new drop-down says "There is no operating system installed in this virtual machine. To install an OS,... ...see, Parallels Desktop Help.  Do not show this message again [OK] OK dismisses drop-down My Boot Camp window command line text includes ... Network bootrom is installed. ... ...No boot filename received. PXE-MOF: Exiting Intel PXE ROM. No boot device is available, press Enter to continue. Tried some suggestions from the website & from the forum, to no avail. How to fix?