Did you try to take ownership of the drive\folders ?
How to take ownership of a file or folder in Windows XP
http://support.microsoft.com/default...b;en-us;308421
A normal procedure would be to remove sp2 by the recovery console
How to remove Windows XP Service Pack 2 from your compute
http://support.microsoft.com/default...t=windowsxpsp2
SOME password problems in the recovery console can be resolved by using the
set of floppy boot disk
http://support.microsoft.com/default.aspx?scid=kb;[LN];310994
If not
http://www.petri.co.il/forgot_admini...password.htm#1