I have a Sony Vaio laptop. At startup, when prompted for my password, the keyboard is unresponsive and I cannot type in the password so I cannot log into Windows nor use he computer

Attached is a youtube video on how to take apart the keyboard.

Are you able to log into your Account? If so download ccleaner and run registry cleaner. That might work

1. Insert the Windows XP installation CD into your computers CD-ROM drive and restart.
2. You will be prompted to “Press any key to boot from CD…”. Press a key.
3. Once loaded, the Windows XP setup menu will give you several options. Press the “R” key to repair Windows.
4. When prompted, selected your Windows installation. In most cases this is “1′. Press enter.
5. You will then be prompted for your administrator password, enter that password. If you don’t have a password set, just press enter.
6. Type the following commands, pressing enter after each line. Replace “e:\” with the letter of your CD-ROM drive.
   copy e:\i386\ntldr c:\
   copy e:\i386\ntdetect.com c:\
   fixboot
   fixmbr
   bootcfg /rebuild
7. After entering that last line and pressing enter, you will be walked through the process of rebuilding the boot file. Most of the prompts should be self explanatory, but here are a few tips:
   • The first prompt should ask you to confirm the operating system that was automatically detected. Make sure the detected OS is the operating system you have installed and then type “y” and press enter.
   • You will also be prompted for a “load identifier”. This is the user friendly name that is displayed when selecting advanced startup options. You can type anything you want here, but it is best to type the full name of the operating system (such as “Windows XP Home Edition).
8. Eject the CD from your computer. Type “exit” and press enter. Your computer will restart, and this time it should load without displaying an error.

try checking the sticky keys are off .this happened to me once.check user book for sticky keys i think its probably the fn + F1 OR F2 OR SO ON to unlock.
hope this helps

OK try doing this below.
NOTE: A recovery also can be performed using recovery discs.

1. Close all open programs and turn off the computer.
2. Disconnect all network connections.
3. Disconnect all peripheral devices.
4. Turn on the computer.
5. When the VAIO screen is displayed, press the F8 key.
6. At the Advanced Boot Options screen, ensure Repair Your Computer is selected and press the ENTER key.
7. In the System Recovery Options window, under Select a keyboard layout: , click the Next button.
8. Under To access recovery options , next to User name: , click the down arrow , and click to select an account with Administrator rights.
9. Next to Password: , type the appropriate password for this account.
10. Click the OK button.
11. Under Choose a recovery tool , click to select the desired option:
    • Startup Repair
    • System Restore
    • Windows Complete PC Restore
    • Windows Memory Diagnostic Tool
    • Command Prompt
    • VAIO Recovery Center
    NOTES:
    
    • The Startup Repair option can automatically resolve certain issues that can prevent the operating system from starting.
    • System Restore can return the computer to a previous configuration of the operating system when it was working properly.
    • Windows Complete PC Restore will restore a previous backup of the computer created using the Windows Backup and Restore Center .
    • The Windows Memory Diagnostic Tool can determine if any problems being experienced are caused by issues with the computer's memory.
    • The option to open a Command Prompt can be used by advanced users and technical support personnel to perform troubleshooting on the hard drive or the operating system.
    • Clicking VAIO Recovery Center will launch VAIO Recovery Center from the Recovery Disc.

You will have to use a Windows DVD and boot on it, try a "Repair" install, If this doesn't "Take" then you will have to do a complete reinstall.

Are you getting the VAIO SAT SURVEY.EXE Stopped working?

1. Press the Windows and the R Keys together..
2. type "msconfig"
3. On the System Configuration Utility window, click the "startup" tab..
4. scroll down to locate the "VAIO Survey/VAIO Sat Survey"
5. Remove the check mark next to it..
6. Click ok..
7. Restart the computer when the Computer prompts..

hope this helps...

please change your key board than restart ur pc

If you have admin login, you should be able to use this to set up another admin account or a user account.

Try pressing F8 on startup and try and login to the computer.

If you have another computer at your disposal there's actually a really nice little program called OPHCrack (http://ophcrack.sourceforge.net/)

Download the LiveCD version, follow the instructions to burn it to a CD.

Put the newly burned OPHCrack Cd in the Vaio and turn it off.

When you restart you will have the options of wiping the password.
Follow the prompts, and when your done, you will have "blanked" your password.

After that, just go into the "Control Panel" and set up a new password under the User Accounts.

Let me know if this helps,
Simon.