i have a similar one.
i had a computer wth WinXP Home. it blew up so i got a new
one.
i also put my old hard drive into the new machine (so i
now have 2 drives).
the prob is that when i try to access the password-
protected admin-user account on the old drive, i
get 'access denied'. it doesn't prompt me for the password.
Look in the Help system for take ownership,
and then (in Home use a safe mode boot to)
follow the directions to take ownership and
then optionally set new NTFS permissions. http://support.microsoft.com/?id=308421