The OS information is enough for now.
From updated part of your first post in this topic, I get that you seem to have only 2 plugins listed. This is strange as the snapshots are shipped with a long list of plugins. In the directory were you have installed mumble there is also a folder called plugins. In this folder there is normally a list of .dll files which are the plugins. Are they present on your system?
To check if the installation is working. When you add a server to your favourites will this server still be present after a restart?
The only problem I can think of is that you do not have write permission to you %AppData%\Mumble directory.
Computer specs: AMD FX-8320, 8GB DDR3-SDRAM, AMD Radeon HD 7950, Asus Xonar D1, Windows 7 Ultimate 64bit/Debian Jessie AMD64.