Yes. I have a password setup for the 2 computers that have network shares. Password Protected Sharing has been turned off a year ago on these 2 computers, though my WDLive still requires a user name and a password.
I will go back and give full control to ‘Everyone’.
This only started happening regularly in the last week or two and I did not make any changes to the network.
One thing I find is that this invalid user name/passoword problem happens with my two Windows Ultra 64 desktops but never seems to happen with our Windows 64 home laptop.