"Windows cannot remove the password. Password and/or account policies require the account to have a password"
Try this:
1. Click Start
2. Type the three letters cmd into the Search box and click OK.
3. Type this command and press Enter:
control userpasswords2 (if you are not an administrator, you will be prompted for the administrator account password)
4. Single-click your account name.
5. Untick the box that requires users to enter a password.
6. Click OK.
7. Enter your current password when prompted and click OK.
If your account isn't listed, try this:
- Click on start, right click on computer.
- Click on manage, under local user and groups, click on users.
- Right click on the account you want to delete the password, and click on the properties.
- Check if “User cannot change the password” has a check mark.
- If yes, then uncheck “User cannot change the password” and ok.
You probably want to make sure that you tick "Password never expires", even for a blank password.
It is not a good idea to still be using Windows 7 - I sincerely hope that your daily user account is not an admin account. It is a really, really poor idea to have an admin account with no password on an out-of-date OS.