Hotmail Cookie Certificat Problems with XP

Every time i sign into Hotmail after i have entered my password, I get a dialogue box that says the certificate is not valid or expired and i have to accept every time i log in!

I have tried changing Internt Options Privacy to Low (NO CHANGE). I have made Hotmail a trusted site (NO CHANGE).
Any advice?

 

this may be a silly questiion but is the date on your pc correct. i had a prob like this and i found my date was a year ahead

 

Thanks for that. That was the problem but I cant see how that happened as the clock is supposed to be synchronized with a clock site on the internet!