This does not occur everytime, but most of the times when I log in to Outlook.com:

This problem only affects one of my computers so it's not a problem with the site, it look like a problem confined to this particular computer.

I'm trying to identify what could be wrong.

As anyone experienced this error before and has a solution? (please refrain from suggestions like reinstalling Windows, or use another computer, or upgrade to Windows 8 or the like).

I've tried using another browser on the same machine and the same problem occurs.

Specs: Internet Explorer 8 (and Chrome), Windows XP SP3, with the latest updates installed.

Any suggestions on what could be wrong and things to try?

Thank you for your time.