Help! Lost Administrator Account in Windows XP SP2!

Hi,

The problem I am having is with my sons laptop computer.

He has a Compaq Presario V2000 and his OS is Windows XP Home Edition with SP2. I had set up the computer as me being the Administrator (under my name) and I created a limited user account for my son. Right now the only account that shows up is my sons limited account. But the computer no longer connects to the internet. I didn't loose or forget the password....I remember it clearly.

Here is what I have tried so far:

1) I started the computer in safe mode, but it does not show the administrator account anywhere.

2) I even went into the adinistrative tools, computer management, properties, to access the permissions with no success

3) On restarting I pressed F10 to access the bios system and change the password from there, but it just doesn't see an administrative account anywhere.

4) I tried running various cleaners, anti-spywear, anti-virous, registry cleaner, registry recovery and even password recovery programs with no success. They all deny me because I am not logged on as an administrator.

I know this has to be some kind of virus! Any help is greatly appreciated.

Thanks
Mike