I upgraded my Parallels to 4.0 from 2.0. I keep getting a message that says I will "have to continue upgrade manually". It says something about running from the Windows XP CD, which for some reason I cannot even find. BUT, anyway, there's no way to run it since Windows won't boot....it keeps going back to a black screen with the message, " We apologie for the inconvenience, but Windows did not start successfully. A recent hardware or software change might have caused this. If your computer stopped responding, restarted unexpectedly, or was automatically shut down to protect your files and folders, choose Last Know Good Configuration to revert to the most recent settings that worked. If a previous startup attempt was interrupted due to a power failure or because the Power or Reste button was pressed, or if you aren't sure what caused the problem, choose Start Windows Normally. " Anyway, I cannot get Windows to start at all. I also upgraded to Snow Leopard, as I was told that 4.0 wouldn't run on Tiger. Can anyone help me?