It may not be possible to do what you want:http://forum.hddguru.com/enter-ata-password-for-usb-connected-hdd-windows-t16102.html
However, if you would like to try, then here is one possibility:
Victoria for Windows 4.3:http://majorgeeks.com/Victoria_for_Windows_d5688.html
Victoria For Windows Detailed English Manual:http://rapidshare.com/files/43334011/Victoria_for_Windows_v4.zip
That said, be aware that if the drive was originally installed in a laptop, then the password will be encoded as keyboard scan codes rather than the ASCII representation of each character. Therefore, even if you know the password, a password challenge will most probably fail.
For example, the ASCII codes for "PASSWORD" are 50 41 53 53 57 4F 52 44 (in hexadecimal).
However the "make" scan codes are 19 1E 1F 1F 11 18 13 20.