i am going to assume its the profile password to log onto windows, correct me if i am wrong.
to remove it, boot into safe mode (F8 while booting)
then select 'Administrator' account
then go into control panel, users, select the profile that has lost password.
then click 'Remove password'
............................................................................................Main System Spec: Intel Quad Q9550 (OC to 3.4Ghz), Gigabyte Ga-ep45-ud3l, 4gb kingston hyperX @ 1066mhz, Corsair tx 650, Nvidia 8600GT.