Windows 7: What is this...Teredo

Hi
I found this today is was not there yesterday, Teredo did a google something about IPV6
If this is bad news pls.tell me how to get rid of it. I have try to delete but it comes back?

Thanks


Ok I just did this to get it to go away

You can disable it using netsh:
Open a cmd prompt
Type the following commands:
netsh
interface
teredo
set state disabled

Do I need Teredo or was it safe to disable?