How to change your Friend's Computer Password without knowing their current Password.
Follow the steps
1. Right click on My Computer/This Pc .
2. Click on Manage .
3. Click on local users and group .
4. Double Clcik on Users <!-- in right box -->
5. Right Click on User Name which you want to change the password .
6. Clcik on Set Password .
7. Click on Proceed .
8. Enter you new Password .
9. Conform you New Password .
10. Click on Ok .
11. Again Click on Ok.
12. Now your job is done . <!--Now you can login to that computer with New Password you set -->
Note : In step 5. User Name belongs to the Name of that Computer User .So this is the actual trick that you changed the old password with out knowing what was the old Password . I hope you will like this trick and i would like to request all the readers Please don't use this trick in such way which can create problems for anyone.