How to install on win 8.1?
The way you asked the question, it sounds like you want to install Linux(I am...
The way you asked the question, it sounds like you want to install Linux(I am assuming), in-place of Windows 8.1. This would be a clean install.
I believe you would like to install Linux alongside windows 8.1. Windows 8.1 uses the UEFI bois to boot the system. To install linux, it must also support UEFI.You can have a look at this documentation to learn about UEFI and dualbooting using this technology. If you want further assistance, post your question on the forum under the appropriate category.