Hi, guys. There are many solutions for you. As far as I know, my classmates use following steps to reset their windows password, and it is said that this method is very smart.

※.Login to a computer that can link to Internet. Download Windows Password Unlocker 4.0 and decompress it on that PC. Note that: there is a .ISO file. Burn the .ISO file to a CD.
※. Get out the newly created CD and insert it to the locked computer.
※. re-booted the locked computer and then followed the process of instructions. Just a few steps, the old password was removed.'''
※. Setting new password:
Step one: Open the "Control Panel"
Step two: Click the "User Account "
Step three: Select the account you wanna to set a new password.
Step four: Click "changing Account " and "set up password", then fill out the form as listed. Click "Create Password".
Thus, you have a personal login ID and Password, any one has no right to login to your computer with out this info.