Re: I need help from somebody who can speak Spanish...
Sean, I can't find any option to switch it back. Apparently, reading the Help, you can't do it either.
This is what the HELP says about changing the language:
Install a different language version of Windows Live Messenger
If you want to change the language used by Windows Live Messenger, you must reinstall Messenger after updating your Windows Internet Explorer language settings.
1. Remove Messenger.
2. Change your Windows Internet Explorer language settings to the language you want to use.
3. Go to the Windows Live Messenger website, and then click Get it free.
4. Click Run.
5. Follow the on-screen instructions, and then click Finish.