There is no method to change fonts in Windows 8 and 8.1 like older Windows Versions where it was possible to change some fonts from "Advanced appearance settings" option present in Personalization window. You need to either configure fonts by modifying registry settings for fonts but changing registry may cause system un-stable. You can also use utility called "Windows 8 font changer" i never use it my self i found the download link for you and scan the "Windows 8 font changer" utility for malware looks clean.
"How to Access “Advanced Appearance Settings” Option and Change Font Size, Color in Windows 8 and 8.1?"
http://www.askvg.com/how-to-access-advan...windows-8/
"Windows 8 Font Changer ( Portable ).zip"
http://www74.zippyshare.com/v/88443103/file.html