You may try the below steps to reset or recover the windows login password:
1) Insert either your Windows 7 installation DVD, or a Windows 7 System Repair disc, into your optical drive
and then restart your computer. If you have either on a flash drive
, that'll work too.
Note: If you don't have original Windows 7 media and never got around to making a system repair disc, don't worry. As long as you have access to any other Windows 7 computer (another in your home or a friend's will work fine), you can burn a system repair disc for free.
2) After your computer boots from the disc or flash drive, click Next on the screen with your language and keyboard choices.
Tip: Don't see this screen or do you see your typical Windows 7 logon screen? Chances are good that your computer booted from your hard drive
(like it normally does) instead of from the disc or flash drive you inserted, which is what you want. See the appropriate link in the tip from Step 1 above for help.
3) Click on the Repair your computer link.
Note: If you booted with a system repair disc instead of a Windows 7 installation disc or flash drive, you won't see this link. Just move on to Step 4 below.
4) Wait while your Windows 7 installation is located on your computer.
5) Once your installation is found, take note of the drive letter found in the Locationcolumn. Most Windows 7 installations will show D: but yours may be different.
Note: While in Windows, the drive that Windows 7 is installed on is probably labeled as the C: drive. However, when booting from Windows 7 install or repair media, a hidden drive is available that usually isn't. This drive is given the first available drive letter, probably C:, leaving the next available drive letter, probably D:, for the next drive - the one with Windows 7 installed on it.
Hope this helps..