When you met one bad thing that you cant solve,believe this,everything will be better, because it can not be worse more.So it is.
Now learn the way to remove your lost or forgotten windows password in case of you get no CD driver,just use the USB flash driver. See the windows how to protect and store your windows password.
1. Password Hash:
When you type in password in Windows XP, NT, 2000 login windows, windows operating system converts (encrypts) these passwords in something like this:
7524248b4d2c9a9eadd3b435c51404ee
This is called password hash and this encryption is done using high level encryption schemes.
2. SAM Files:
In windows Operating system, these password hashes of every user account are stored in SAM Files. When user types in password on login screen, windows compares this SAM file contents with typed password and allows access (if matched). So, it is necessary to get these SAM files, if you want to recover your password.
3. Retrieve the password from the SAM file:
a). This SAM File is locked during active windows session and hence cannot be accessed without booting. Thus, you have to boot system from another Operating System (NTFSDOS or Linux usually) and then copy SAM File to floppy drive or convenient external device like USB flash drive.(Now we use USB flash drive)
b). Then insert the USB flash driver into another computer,and this tool LC4 is needed(Get from:http://www.net-security.org/software.php?id=17).Run LC4,and create a new task,then click “IMPORT->Import from sam file” open the SAM file which is need to be decrypted,you have copied it into the usb driver,then,LC4 will auto analysis the SAM file,and show the account.Then click “Session->Begin Audit”,starting to retrieve the password stored in the SAM file.If the password is not very complex, you will get the result your forgotten windows password in a shot time.
Just know such tools for windows password recovery.
1. Kon-Boot(http://www.piotrbania.com/all/kon-boot/)
But I had some problems with it doing an infinity loop when I tried to use Kon-Boot from a USB flash drive (worked fine on the same box from a CD). Then I find an article guide you to use it correctly.Read on Using Kon-Boot from a USB Flash Drive: Bypass those pesky Windows and Linux login passwords completely
2.USB ophcrack
If you think this is the normal ophcrack. You must be wrong.
This is the ophcrack update by some computer-lover.
Download USB ophcrack.USB Ophcrack flash drive creation essentials:
Windows Computer (Windows XP or Vista)
1GB or larger flash drive (fat32 formatted)
USBOphcrack.exe
Next to show the steps to create a bootable Ophcrack flash drive:
1. Download and launch USBOphcrack.exe , extracting to your PC (contents are extracted to a directory called USBOphcrack)
2. Click USBOphcrack.bat from the USBOphcrack folder on your computer, and follow the onscreen instructions. Note that the ISO downloads, USB conversion and installation to your flash drive will take some time.
3. Reboot your PC and set your system to boot from the USB device
If all goes well, you should be booting from the USB stick into a mini Linux environment. Ophcrack is launched automatically after the system has booted. You should now be able to recover both Windows XP and Windows Vista login Passwords using this single USB tool.
The way is not so easy compared with protecting your password well.Jut do it.
The content source from windows password recovery blog: http://www.anypasswordrecovery.com/blog/