My children were playing with my computer and changed my lock code when i turn it on it says enter HDD pasword

go to bios sistem and then change the admin pasword to clear it coment please !

try : hirens boot cd iso let you repair all paswords

How Do I Change the Primary Master HDD User Password?

Prior to loading an operating system, your computer will first execute the BIOS program. The BIOS has an extra password feature, called the hard disk drive (HDD) user password, that can't be bypassed and provides a layer of defense to keep your data secure. To change an existing HDD user password you will have to load the BIOS menu, which is only accessible during the computer's operating system reboot procedure.

Instructions

1. Close any windows that are currently open on your computer. Eject any discs inserted into the optical drive and disconnect any peripheral USB devices.

2. Open the "Start" menu and select "Shut Down." Turn on your computer once the operating system finishes shutting down.

3. Press the key your computer uses to load the BIOS menu. For example, with Dell computers tap "F2" when the "Press F2 for Setup" option appears. Press the "Access IBM" key on IBM laptops or "F10" on HP desktops.

4. Navigate to the BIOS tab that contains the HDD password option, which will usually be the "Security" tab. Some computer manufactures instead include the password option in the "Advanced" tab.

5. Scroll down to the option labeled either "User Password" or "BIOS lock" and hit "Enter." Type the current master HDD user password when the prompt appears and press "Enter."

6. Input a new HDD user password and hit "Enter" again. Navigate to the BIOS tab labeled "Exit" or something similar.

7. Move over to the "Save and Exit" entry and press "Enter." Select "Yes" and tap "Enter."

hello The parental control menu enables
you to limit access to programs that
may contain objectionable material
or are not suitable for viewing by
children. The default access code is
0711
may contain objectionable material
or are not suitable for viewing by
children. The default access code is
0711.
The following table provides details
about the menu items:
Component Function Range / Options
Lock Enable Enables the parental control lock. When
enabled, channels with objectionable viewing
content are blocked and can only be
accessed with a password. You can block
channels according to the movie or TV ratings
of the channel’s programs.
Off, On
Movie Rating Helps you block programs based on their
movie ratings. See “Movie Rating” on
page 25 for more details.
–
TV Rating Helps you block programs based on their TV
ratings. See “TV Rating” on page 26.
–
Change Code Changes the password for the parental control
lock.
Press the number keys to
change the password.
Reset Resets all channels and programs to their
default factory settings.
–

regards
shaun
Parental Control Menu
Lock Enable
Change Code
Reset
Back
Main Menu
Picture
Sound
Size
PIP/PBP
Parental Control
Channel Setup
Setup
Exit
Press Right to Enter
Press Right to Enter
Press Right to Enter
Press New Code
Off On
TV Rating
Movie

Read some Acer manual and it says:

Administrator Password

The "Administrator Password" can be used in both the "Enter
Administrator Password" and "Enter Password" dialog boxes.
• Press "Play" to change the "Administrator Password".
• The factory default of "Administrator Password" is "1234".
If you forgot your administrator password, do the following to
retrieve the administrator password:
• An unique 6-digit "Universal Password" which is printed on
the Security Card (please check accessory in the box). This
unique password is the number which will be accepted by
projector anytime no matter what the Administrator
Password is.
• If losing this security card and number, please contact with an
Acer service center.

You should be able to change the password and just leave the new password entry blank. This should efectivly clear your HDD password.

Most modern laptop HDD or BIOS passwords are not resettable and don't come with default passwords to unlock them if the password is forgotten.

You will need to contact Acer and find out what kind of warranty coverage your machine has. It's likely that you will have to pay for the services they provide or pay for a new hard drive yourself and re-install Windows.

Found this information on the Phillips USA website. http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?scy=US&slg=AEN&cat=DVD_HOME_THEATER_CA&sct=DVD_PLAYERS_SU&session=200906 This information is in the owners manual on page (45). I hope this information helps you with your problem You need to enter your six-digit
password to play a prohibited disc or if
prompted for a password. The same
default password is used for both
Parental and Disc Lock.
A In ‘Preference Page’, press 􀁓 􀁔 to select
{ Password }, then press 􀁘 to select
{ Change }.
B Press OK and the menu appears on the
TV screen.
Old Password
New Password
Confirm PWD
OK
C Use the alphanumeric keypad 0-9 to
enter the six-digit password.
􀃎 When doing this for the fi rst time,
enter the default password ‘136900’.
􀁺 If you forget your old six-digit password,
enter the default password ‘136900’.
D Enter the new six-digit password.
E Enter the new six-digit password a
second time to confi rm.
􀃎 The new six-digit password will now
take effect.
F Press OK to confi rm.

If you are sure no one has tampered with it and entered a HDD password and it is not prompting for a password then it is most likely a HDD failure. It is possible the BIOS will still recognize the HDD. Try disconnecting and reconnecting the HDD if you can access it there should be screws on the bottom marked with a cylinder symbol.

In your bios you should be able to change your settings for the hdd. Make sure everything in bios matches your hdd & then save changes & reboot. Hopefully that will allow you to enter windows.