HOW TO SET NEW PASSWORD IN PC NO NEED TO KNOW OLD PASSWORD

Just follow the simple steps.
1. Just open the Run box by press Win Key + R.
2. Type "lusrmgr.msc" as shown in figure 1. (without double quotes")
3. The "Local Users and Groups" window will be open as shown in figure 2.
4. Double click on "Users" folder. All the system user accounts will be showed as shown in figure 2.
5. Right click on the account name which you want to change the password and select "set password".
6. A warning will be shown as shown in the figure 2.
7. Click on "Proceed".
8. The "Set Password" pop up will be opened as shown in the figure 3. Give the new password two times and click OK. That's it, the password will be changed.