delete windows admin without eny apps

Delete Administrator Password Without any software
Method 1

Boot up with DOS and delete the sam.exe and sam.log files from Windows\system32\config in your hard drive. Now when you boot up in NT the password on your built-in administrator account which will be blank (i.e No password). This solution works only if your hard drive is FAT kind.

Method 2

Step 1. Put your hard disk of your computer in any other pc .
Step 2. Boot that computer and use your hard disk as a secondary hard disk (D'nt boot as primary hard disk ).
Step 3. Then open that drive in which the victim’s window(or your window) is installed.
Step 4. Go to location windows->system32->config
Step 5. And delete SAM.exe and SAM.log
Step 6. Now remove hard disk and put in your computer.
Step 7. And boot your computer :-)

Step 1 : Adding a new contact


Sign in to your Gmail account, and open up the Chat pop up menu from the bottom left if it already isn't there. Click on the little arrow, and Add a new contact.
You will asked to enter an email to invite a contact. Note that if you want to chat a friend that is already your contact, then you can skip ahead to the next step.
Step 2 : Adding mobile number

Now, hover on a contact of yours, and click on the Send SMS button as shown below.
Note : If you haven't sent that contact an SMS before, of if you haven't added their number, then instead of the Send SMS button, there will be a Chat button at the exact same position. Click on this button and you will see a small pop-up at the bottom right of your screen, as shown below.

Click on the Continue this chat over SMS button. This will only appear if you haven't added their number, or haven't sent them an SMS before. Otherwise, you will be able to enter your SMS in this pop up. Once you click the continue button, you will be prompted to choose a country and mobile. This is the contact's mobile number. Add a number and then save.
Step 3 : Chat away!

Once you have entered the mobile number, a pop-up will again appear at the bottom right exactly where the previous one did. This is your chat box. You are now ready to go! Type a message in the text field , hit Enter, and sit back and wait for your friend's reply!
SMS credits
This is a smart way Google has found to encourage the use of this service. Initially, you are given fifty credits, which means you can send out 50 messages. For every one message sent, one credit is deducted. But for every message received, say when someone replies to your Gmail text, you get 5 credits. So tell your friends to stop being miserly, and start replying to texts :). You can not, however, exceed the 50 credit limit, no matter how many replies you get.(www.besthacking.in)

What if you lose all the credits?

You will receive one credit after 24 hours. A smart way to increase your credits would be to send a text to your own mobile phone, and then replying to it any number of times to refill your credits!