Acer Altos G530 - Manual (Page 122)

4 BIOS setup 112
Removing the User password
1 Use the up/down keys to highlight the Clear User Password
parameter then press Enter.
2 Enter the current password then press Enter.
3 Press Enter twice without entering anything in the new and
confirm password fields.
After doing this, the system automatically sets the User password
parameter to Not Installed.