Installation:
Extract Data into your game directory. Usually it's C:\Program Files (x86)\Steam\steamapps\common\Fallout New Vegas

Uninstallation:
1) Go into C:\Program Files (x86)\Steam\steamapps\common\Fallout New Vegas\Data\Sound\fx\ui\vats
2) Delete these files:
ui_cats_enter.wav
ui_vats_exit.wav
True To Caesar!