Logon Problem - New XP Pro SP3

Hi

I am new to the forum. I have just completed my first PC Homebuild. These are the component parts:

Gigabyte GA-EG43M- S2H Mobo - Intel Core 2 Quad Q6600 LGA 775 - 4 Gb Corsair DDR2 667 Mhz - Sata 2 500 Gb HD - Samsung internal DVD RW.

All parts are brand new never been used before or installed anywhere, all seem to work ok.

I bought a sealed new copy of XP Pro SP3 which had never been installed before. All went well till I reached the last stage of the installation when much to my surprise the system demanded an Administrator Password ?

Clearly, I have not created any passwords at all. Windows simply will not start. I receive the following error message every time

"The system cannot log you on due to the following error:
The specified domain either does not exist or could not be contacted.

Please try again or consult your system administrator.

I have even tried the Shift+F10 during the 'device install' part of the Windowd installation programme, to change /remove any paswords - this had no effect. I have tried 'Enter' with a blank password box, no effect whatsoever. It just refuses to start Windows XP.

Any help or advice will be appreciated.

Thanks

ps I have seen on the web that other appear to have had similar problems but no ready or obvious solution.