Which password are you looking for, the Windows password or the BIOS password? If it is a Windows password you could try Switch Users and login as ADMINISTRATOR and login with no password. A lot of times users do not setup the admin password when they first setup their computer. Lets hope yours fall under the same situation. If not then you will need to hack your computer. We can not directly tell you how to do this so you will have to find it on your own. Just Google "How to hack Windows Vista" or a key word like "Rainbow Tables".
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