How to RESET SECURITY PHONE?

if you are refering to a password
click start control panel Open User Accounts in Control Panel. On the Users tab, click the name of the user whose password you want to change, and then click Reset Password. In New password and Confirm new password, type the new password, and then click OK. Notes You can change passwords only for local computer accounts, such as guest, administrator, or accounts you create for your computer. You cannot change your network logon password in User Accounts. To change your own password, press CTRL ALT DELETE and then click Change Password
also
if you are not the computer administrator and have not assigned a bios password during the boot up process you will see on the screen for a short amount of time press a certain key to enter set up Press and hold that key during the boot up process to enter BIOS scroll down to set user password or supervisor password you can change or remove your password from there also click start control panel user accounts on the users tab,click the name of the computer administrator you must have full control can change the password there