Inspiron Laptop - about 1 year old, had virus or rootkit, too much to remove, did a factory restore.

On factory restore "first time setup" I must have either typed in the user password (where you set the password for the first time) or something went wrong.

So now I have a factory restored laptop with 1 user, user is admin, but I do not know the password.

Every method I have tried to do another factory restore or unlock it requires this user password. Tried to get into Dell tech support chat for 3 days. Called in phone support. Sat on hold for 2 hours to get Dell tech support, told this type of issue not under warranty, switching me to software department. Switch. Software department closed. Call hung up.  Sigh.

All I need is to factory reset again without knowing only user password, or some other way to login and change password.  The only disk that came with it is a driver disk.

I do not have a password recovery file or disk or any other image back up.

 

It has Windows 7.

Any help?