cannot sign into my hotmail account on my laptop

I am able to sign in and retrieve messages from my hotmail account from every computer except my laptop.

 When I try to sign in it keeps telling me that my login or password is incorrect.  I retype it several times and keep getting the same message.  After several tries it will go to the Microsoft Live sign-in page where it repeats the same thing.  After several attempts there, it sits on the Microsoft Live sign-in page and does nothing.

I have Windows Vista (32 bit) on my Gateway laptop.  I have deleted all cookies and temp files as suggested by Microsoft and have set hotmail, live, and microsoft as trusted sites in my internet options.  What can I do to resolve this problem?