Hotmail Login

I have a user who is running WinXP and frequently uses Hotmail as a backup when her office email goes down. After loading Ad-Aware SE she can no longer login to her Hotmail account from this system. After creating a new Hotmail account for a different user, we could not login that user to Hotmail on this system either. Login works fine on other systems. The login attempt results in a blank IE screen and what appears to be a hung processor.

Any ideas on the cause and recommended correction?