Solution 1
Forgot Windows 10/8.1/8 password on Acer laptop, such as Acer Aspire? I will probably recommend you 3rd-party software to reset Acer laptop windows 10/8.1/8 password. Because it works well and quickly when you don’t have password reset disk, available administrator or other sign-in options.
And the Windows password reset program, Windows Password Genius Advanced is my favorite. The major steps are software download and installation, burn software into bootable USB drive or CD/DVD-ROM, boot locked Acer laptop from burning device and reset/remove Windows 8/8.1/10 password.
Solution 2
For Windows XP/Vista/7/8/10, there is a built-in administrator for users to login computer. But it is not enabled by default. So when forgot Acer laptop Windows XP password, we can bypass forgotten Acer laptop Windows XP password with enabled built-in administrator.
Step 1: Press F8 when powering on Acer laptop.
Step 2: At Advanced Boot Options window, choose Safe Mode and press Enter.
Step 3: Choose and click the Administrator account at the Windows logon screen.
Please note that if you’ve ever set this administrator password, you need input the password set before. If not, you should keep the "Password" blank.
Step 4: Click Start > Control Panel > User Accounts, select the account needed to reset password and input new password.