This problem has been addressed many times.
To answer your question which could be rephrased as : "How do I install Windows 8 (Windows 8.1) with an .exe file?"
http://kb.parallels.com/en/121009
For method 2 you can use a Windows trial as a temporary VM, in this case MS actually provides ISOs: http://www.microsoft.com/en-us/evalcenter/evaluate-windows-8-1-enterprise
(there's no way to convert the Windows trial to non-trial)
Last edited: Aug 30, 2014