itmss files don't work

Hello,

I'm trying to create a new account in itunes.
The activation code was sent to my mail, and when I click on the activation link, the browser is trying to open an itmss:// address.
The problem is that this url type is not associated to my itunes program on the computer, thus it can't be opened and I can't activate the account.

I have Windows Vista and I was trying to reinstall itunes, but it didn't help.

Can someone help me?

Thanks,
Edi.