xp professional - local administrator password

[roni_size () ig com br]

Hi , i have 25 computers , working w/ windows xp professional - client , my 
private intranet use the windows NT . Some workstation w/ xp , apeared w/ 
the administrator ( local ) password changed , anybody now how i can change 
that password again , w/ the permissions of a normal user. 

thanks 

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