The Problem goes like this: My home PC "Hp (XE4400?)" laptop worked just fine earlier today, but when I tried to use it later, It keeps asking password to my account and guest account (which is now enabled, but hasn't been before this)! I dont have a password in my account, and I have always kept guest account "disabled". Also tried to log in as an "administrator" without password, like it should be but cant do that either.. So now I can't log into my computer! What's wrong? Popup msg after failed login says something like "Can't log you to a domain or computer or something sometthing..." anybody can solve this problem please?