The first and probably the easiest way is to use the default administrator account to reset your password.The default administrator account is activated at the time of installing Windows 7. Using Default Administrator Account to Reset Password
The following are some free ways for Windows 7 Home Premium Password Reset that you can easily try out to reset and change your password, so you will be able to log in again and start using your computer. Part 3: Reset Windows 7 Home Premium Password with Passper WinSenior Part 1: 3 Free Ways for Windows 7 Home Premium Password Reset Using Windows 7 Installation Disk to Reset Password Using Safe mode in Windows 7 to Reset Password
Part 1: 3 Free Ways for Windows 7 Home Premium Password Reset