This shouldn't happen with any mod, actually. A few years ago there was a looping issue with Weidu202-204 and mymod.bat files(different auto-updating routines), but it was back around 2008-2009 and we should be fine now.
Let's try and check this: after running XanBG1Voice_v1.exe, it unpacks in your BG2 directory, once. If it doesn't install properly(autoupdate, user quitting or whatever), please, run Setup-XanBG1Voice.exe in your game
directory as the mod's readme says. It should install immediately, once, no loops.
If that doesn't work, then 1) post the looping message here; 2) read this topic, please, it has some anti-looping instructions circa 2008:
http://forums.gibberlings3.net/lofiversion/index.php?t15164.html . Best of luck!