I want to use my login password to autounlock a passwordmanager. Is there something which makes this possible and fairly secure?
A "password manager" can mean two slightly different programs.
If you are looking for a database where you can keep your own information, check out KeePass – it has an option to protect the database using your Windows user account. (This feature is only available in the 2.x series, though.)
Technically, any software can be made to work in a similar way, if you use the "Encrypted File System" (EFS) feature in Windows. (Win 7 has it starting with Professional.) All files you encrypt using EFS are encrypted with a certificate which is in turn protected with your Windows password. (Make sure you back up the certificate and the private key; Windows 7 should prompt you to do this.)
This means you can create a database using Password Safe or KeePass or Notepad without any password, only encrypted using EFS, and it will be securely protected using your Windows password.
GNOME Keyring is primarily intended to be used by other programs. In Windows, the same can be done using Credentials API: programs can store passwords through
CredWrite()(in the form of CRED_TYPE_GENERIC), and you can browse the same entries through Control Panel – Credentials.