A tutorial on using MAMP and Windows 8.1
If you want to test out an alternative then Desktop Server is a very good option. For more info...
For more info on Desktop Server check the following page on my tutorial website:
http://easywebdesigntutorials.com/desktop-server-the-mamp-xampp-alternative/
I am using Parallells as a virtual environment for Windows 8.1 on my Macbook Pro.