Keyring is a password manager which keeps all your passwords you use in Nautilus.
At 1st prompt, it asks for a keyring password to configure. Later, it stores all other passwords and asks only the keyring password each time you try to access something in nautilus.
If you happened to forgot what you had entered earlier as your keyring password, then install "gnome-keyring-manager" which will help you I hope. The KDE equivalent is KDE-Wallet manager.
I have no idea about the /tmp/keyring*, if you are unsure about the consequences of deleting a file, then dont delete just rename the file and see if it works.
--Dipu
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Windows? reboot. Linux! be root!!
http://www.smartdipu.info