Yahoo email account

I have an email account, which when i try to sign in on my pc, i get a "page cannot be displayed ", rather than reaching my mailbox. This does not happen when i try to sign in on other email accounts.

However, when i try to sign in to this problematic email account from another computer, i sign in and reach my mail box successfully.

Any ideas, why this is happening only to one pc ?

Thank You

 

Thank you for your reply. Unfortunately, i do not think that this is the problem, because with other user names, i manage to so sign in with no problems on the pc in question. Eventually, i also used to sign in successfully, with this userid up to a couple of days ago. However, as i said in my previous post, i am still able to sign in with this username from other pc's. Therefore my problem is only with 1 particular pc and to 1 particular userid.