4 ways to break windows 7 password without software

The 4 ways are divided into 2 sections depending upon the access :
1. Access to administrator account(3 ways).
2. Access to guest account or simple user account(1 way).
If you don't have access to any account on the PC. There are only two ways to enter the system through Backdoor or by using a Third Party Software.

Access to Administrator account

Using Command Prompt(cmd)

Command Prompt mostly referred as cmd is the windows command-line interpreter. Steps to break password using windows command prompt are:
Step 1:Click on start type cmd, right click on the program cmd and select run as administrator.

Step 2:Inside cmd window type

net user User_Name *

where User_Name is the name of the account whose password you want to break, if you have any doubt regarding the user name of account you can check all the user account using net user command.
Step 3:Command Prompt will ask you to type a new password for the user.

Using Local Users And Groups

Local Users and Groups is a part of Computer Management. Steps to break password using Local Users And Groups are:
Step 1:Right click on My Computer and select Manage to open up the Computer Management. Select the first option System Tools.

Step 2:Then select Local Users and Group from the System Tools. Two folder with name Users and Groups will appear in front of you.

Step 3:Open up the User folder and right click on the user name whose password you want to change. From the list of options select the Set Password.

Step 4:Click on Proceed on the dialogue box.

Step 5:Enter the new password for user.

Using User Accounts

Step 1:Press the windows key+r on keyboard to start the Run. Inside Run type control userpasswords2.

Step 2:User account will appear, Select the user account whose password you want to change.

Step 3:Select the Reset Password option present in the bottom and enter the new password for the user.

Access to guest account or simple user account

Step 1:We will use the ring 0 exploit which provides privilege escalation on every version of Windows (from NT until 7). Download the exploit from here.
Step 2:Unzip the file and open up the folder.
Step 3:Run the file vdmallowed.exe, a command window(cmd) with admin privilege will open up.

Step 4:Now use method 1 (using command prompt) to change the password.