Problem with Yahoo Email

Hopefully I can explain this fully. I am having a problem with my yahoo email. When I go to log into my mail it will have my username already filled in and then ask for my password. When I put in my password and press enter the screen will refresh and to going to my inbox but will then go back to the same screen. It does not say that I have the wrong password. Then I click to completly sign out and I put in my username and password and it goes back to the screen where it displays my username but then asks for my password. I type in the password and then it goes back to the screen and shows my user name but the password is blank. I erased my cookies, deleted my temp internet files and deleted my history. I had some wintools spyware on my computer that I got rid of thanks to instructions from this board but the only way that I can get into my email is to click the mail link from my yahoo messenger. Any suggestions?

Thanks for your input,

Marty

 

I've had this problem for a while. I don't go straight to the sign page, instead i go to the mainpage and then click on mail. Quite frustrating, really.