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In order to recover your lost account password XXXXX Vista, you may use a password XXXXX tool; I would suggest you to download the following freeware tool, in order to try and reset your password:http://nchc.dl.sourceforge.net/sourceforge/pcloginnow/PCLoginNow_Full_2.0.iso
Once downloaded, please burn the ISO image to a CD/DVD disc, as follows:
After burning, bootup your system using the disc; the recovery tool, PC Login Now, will start automatically.
To delete your existing Windows password, follow the instructions on-screen accordingly. Choose your OS installation and then the user name for which you want the password XXXXX be deleted. Be sure to check the password XXXXX XXXXX checkbox after choosing your username; this will remove the password.
Now, you'll be prompted if you want to reset another user's password; choose No and then OK to reboot. Remove the disc as soon as the computer reboots, and load up your OS as you do normally, and see if you can login to your account now.
Let me know, how it goes.