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If you get the error “A referral was returned by the server”, look here:
[Link]

Drop that exe in your Mumble folder in Program Files (replacing the old one).

This is the fix

run as XP service pack 3
Run as admin

do these 2, worked for me

running mumble 1.2.3 if you want to ask about update

Quoted from frymaster

No need to run as admin. A security update from Microsoft has expired a security certificate mumble was using. Updated installers are available:

Uninstall mumble first

Mumble 1.2.3 installer
Latest (as of this post) mumble snapshot

Especially if you use the overlay, I reccommend running the snapshots. There’s known issues on 1.2.3 where mumble UI lag can cause fps drops

edit: [Link]Source[/url]

Damn, no way to save my channels and sound settings, then?

the server list and settings are saved in %appdata%/mumble folder… u do need to backup your certificate though to keep authorization in servers

Try the snapshot version

Quoted from Trane

Try the snapshot version

Same error
Quoted from BlinkBoy

[...]
yep,you have to download it from here [Link]
:)

I did, tried it again, didn’t work
Restarted my PC and it still doesn’t work

When I try and open either installer (snapshot or normal) and I get the same error message “This installation package could not be opened. Contact the application vendor to verify this is a valid Windows Installer package.
I’ve un-installed mumble so I can’t do the simple replace mumble.exe for the new one.
I’ve disabled UAC.
Still stuck
Help anyone? :/
Edit: Fixed it, just copied someone elses program files mumble folder