Cannot access system -- forgot password. Cannot

Before your computer loads your operating system, it starts by running the BIOS program, which is extremely important because of its various options.

You can even set a password on your hard drive so that nobody can use your laptop computer without your password.

Once you put in the password into your hard drive, you can only remove it by accessing the BIOS system and deleting the password completely from the memory of your computer.

Save all of your important files on an external hard drive or similar storage device.
This is a precaution to avoid losing all of your files when making changes to the BIOS.

Then, restart your computer.
Wait for your computer's operating system to ask you to access the BIOS menu.

This may be at different times, depending on the manufacturer of your computer.
It can ask you when the manufacturer's logo comes up, or on a separate screen indicating for you to click the "F2" button on your keyboard to start.

Access the BIOS menu by clicking the key or combination of keys that you are informed to click. This information can be found in your computer's manual, but it changes between different companies.

Commonly used keys for this process are "F10", "F2" and "Delete."
Go to the BIOS option that contains your hard disk drive password.

The option that will lead you to this password varies immensely due to different laptop models, but it may appear as something such as "Advanced" or "Security."


Look for the option for changing the password, which should say "User Password," and then click "Enter." Put in the existing password and then click "Enter."

Do not enter any password into the blank fields asking you to enter a new password, and this will remove the password.

Exit the menu by clicking "Save and Exit." Click "Enter."

The BIOS (Basic Input Output System) is designed to check the integrity of the computer hardware and launch the operating system. The BIOS also has basic security features that prevent unauthorized access to the computer by locking the hard drive with a password. The password is required in order to launch the operating system. That option can be disable without an changes to the operating system.

Turn your computer on. Press "Esc," "Del," "F2" or "F8" to access the BIOS. Use the arrow keys to go to the "Security" tab. Press "Enter." Highlight "HDD Lock," Boot Password" or "Hard Drive password" using the arrow keys. Press "+" until "Disable" appears. Go to the "Exit" tab, highlight "Save and Exit" and press "Enter." Press "Y" when prompted to reboot your computer without the hard drive password.

To re-enable the Console access requires the SW2900 series to be reset to its default settings via the WEB INTERFACE
- Web Interface
- Device >Configuration >Initialize To change the Default User "ADMIN" password it is necessary to use the Console connection
-Console Interface
-Once the unit has successfully booted and the prompt presented
-Enter "password" (without "")
-Enter "admin" when the system prompts for User
-Press the "Enter" key when the system prompts for "Old Password" (the ADMIN password was reset by the Web Interface commands)
-Enter "" when the system prompts for the New Password (where "" is the new product ADMIN password)
-Enter "" when the system prompts to confirm the New Password In order to complete the configuration it is necessary to save the configuration via the WEB INTERFACE
-Web Interface
-Device > Configuration > Save
Symptom:
SW2900 Baseline Switch - Default console access disabled following password change
From the web interface, the default user "admin" password is changed and console access is disabled
Cause:
When applying the new password, by default the service-type is set to "telnet". When applied, the default "terminal" setting is removed thus disabling console access.

Step 1:
Which model of acer laptop ? there are many

The BIOS (Basic Input Output System) is designed to check the integrity of the computer hardware and launch the operating system. The BIOS also has basic security features that prevent unauthorized access to the computer by locking the hard drive with a password. The password is required in order to launch the operating system. That option can be disable without an changes to the operating system.

Turn your computer on. Press "Esc," "Del," "F2" or "F8" to access the BIOS. Use the arrow keys to go to the "Security" tab. Press "Enter." Highlight "HDD Lock," Boot Password" or "Hard Drive password" using the arrow keys. Press "+" until "Disable" appears. Go to the "Exit" tab, highlight "Save and Exit" and press "Enter." Press "Y" when prompted to reboot your computer without the hard drive password.

Do a complete format and then reinstall your operating system, start from scratch,if you use another password save it somewhere you can find it.

If your hp computer is installed with Windows 7, following the video to learn how to reset hp computer security password with Windows 7 Password Genius
https://www.youtube.com/watch?v=I5HzG7fb-Wg
If your hp computer is installed with Windows 8, and the password is your only admin password, refer to hp computer Windows 8 admin password reset.

The simplest way to remove a BIOS password is to simply remove the CMOS battery

this looks like you have kept the bios password and you forgot it. just do one thing open the cpu case to access the inside of the system and then just remove the battery in it. wait for 5 min and again plug in the battery. thats it your bios memory password will be reset.
2nd solution without removing battery. just reset the bios as shorting the jumper pins. consult your motherboard book to know where to find the bios reset. it will be written as CLEAR CMOS.

This question has been asked (and answered) hundreds of times. Here is the best answer I pulled up for you.
http://www.windowspasswordsrecovery.com