Why I can’t open Yahoo & Gmail account in my computer ?
To open an account in both Yahoo mail and Gmail account is problematic. You have need to registered with Yahoo mail and Gmail registration. You will obtain mail account ID and password. You have to necessary to sign in at yahoo mail and Gmail account.
Whenever you have failed to open your mail account you must have to look whether you have done out of order. Correct your mail ID and mail password. After you done to write correct ID right password you will be able to open Yahoo mail and Gmail account. Try to do the registration in dual.
When accessing Gmail and Yahoo email, this sometimes log-in as secured. Check the computer software settings, specially if the HTTPS is set to enabled.
If message says un-trusted sites, then you have to check the computer clock. This has to be synchronized to the time and date in the place where you at. This message will pop-up if time and date are incorrect hence this gives you access to unprotected area if not fix.
Update the security certificate on your browser, this eliminate the problem. Once the browser security certificate, you should be able to access the website, specially if it's a secured website like Gmail and Yahoo account.