Forgotten ID and Password to start Windows2000. How can I start my PC with this situation?

I re-installed Windows 2000. When I start PC (windows 2000), there is ID and pasword required,I don't like to see evety time when I start. And then I deleted one name from User something in comtrol pannel.
My PC is Presario, Compaq. The data I deleted was Presario. there was one more Preario name and Guest were on list of users.
Now what I can do is to start PC but one box which are asked ID and Password. Maybe I can do something on MSDos,but I don't know any commands for it. (not used to MSDos).
Please help me!
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try username 'administrator' with a blank password

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