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