How can I recover a lost xbox live account without knowing the email, on PC.

The only way to recover the email address associated with your account is via the steps here Find your Microsoft account email address | Xbox Support

Lost account solution

You can try the lost account solution to recover an account without knowing the email address.

I cant reset the password without the current one. I'm trying to recover it. I don't know how to get it for an xbox live account created with a yahoo email account instead of a hotmail, msn, etc.

If you don't know/remember any of the login for the account, there's a good chance that account may be lost forever. Without the proper information such as the username/email, password, security question answers, phone number, etc... it'd be virtually impossible
to recover the Microsoft Account associated with your Xbox Live profile.

This page details some information on how to find a lost account as well as when an inactive/closed account is officially closed/lost for good: https://support.microsoft.com/en-us/help/13811

Hello ,

Thanks for posting on the Xbox forums. We understand that you are interested in recovering an old Microsoft account that you used to use on Xbox 360. It's great that you remember the email address to your account. The first step to recovering an account
is knowing the email address that is used for the account. You can change the email address that is used to log in to the account after you recover your password. We have a support article that explains

how to recover your password. Be sure to let us know the results !

I don't have access to the email the account is linked to, Time Warner Cable had control of the email when they merged into Spectrum, so I lost the email and it was before 2 step verification was a thing. All I have is the email the account is linked too
and the Gamertag.