Cant log in to my account yahoo keeps on saying that my accountdoes not exist

If you gave him your password and your username for your email account or for your messenger account then he can log in to your account and change the password to one only he knows. If he can get into your email he can read all your old emails. If you use the same password for multiple accounts, he can keep guessing at what accounts you might have and try the password. Even if you have accounts that don't use the same password but use your email address to log into, he can try to log into those with your email address and say he doesn't remember your password and they'll email him a new one.
Sounds like you're screwed. Call your ISP (Internet service provider)

Click the "I can't access my account" link on the Yahoo sign-in page.

you just simply send a fax or you can call to yahoo media office for your problems.

Phone (408) 349-3300 Fax (408) 349-3301 Office Hours 8:30 a.m. to 5:00 p.m. PST

You can't. You cannot be simultaneously logged into 2 yahoo accounts. You need to log out of the existing one to log into the second yahoo ID. However you may be simultaneously logged into 1 yahoo email and ine google or hotmail. The way around this is to have a second user account on the computer and be logged simultneously into both user accounts, and be logged into a diffferent yahoo email in each user account

Yes , you have to create an account. But as you say you already created an account, Please check your ID and Password if it is correct and log in again. And you can access your mail that mean you will access messenger. Please use the ID and Password you used in creating the account to log in.

why, you can't log in your yahoo, is either your password or user name is not correct or properly entered. So check if you enter the right password or user name to log in. Because there is no way you enter the right user name and password and you can't in.be sure of what detail you use in creating your account.

mcdevito75 here At yahoo home page click contact us the see troubleshooting.

There is a problem with yahoo. I called them in the US from Australia - well so they told me it will be fixed in a day.

I suggest you to check whether your email address and password is correct or not, by logging in at the www.yahoomail.com website, If you are able to login then your account exists and the email address and password is correct.
If it shows wrong password, try forgot password.

If you are able to login to your account in website, only you cannot login in yahoo messenger, There might be some problem in yahoo messenger, I suggest you to download the recent version of yahoo messenger and try logging in, if problem persists check your internet connectivity, Sometimes we couldn't login if there is a problem in internet connection.
There may also be problem with windows firewall settings.

And also check whether the yahoo messenger is added as exception in the windows firewall or not, If not add the yahoo messenger to exception list.

can,t log in my yahoo messager it keep saying try again