I have used parallels for many years on my 2011 iMac running Windows 7. I have just upgraded to High Sierra and got a Windows 7 message "your computer was unable to start" when I tried to run parallels v11. I have now downloaded the free Parallels V14 software, but get the same message. The exact error message reads "StartRep.exe - Application Error. The instruction at 0x74e68f0a referenced memory at 0x000000004. The memory could not be read". Any ideas what might be going wrong?