[Okay, first, let me preface this by saying I am using Windows XP, not Win7, so the millions of topics already covered don’t concern me I also don’t have Windows SignIn Assistant.]
I just got a WD TV and it finds the computers but is unable to connect to the shares. Every error is “Invalid username or password. Please try again.”
I tried two working accounts and I know the passwords work, but it just doesn’t happen on WD TV Live. Why?
I already tried this: Home -> Settings -> Clear Login Info
What firmware are you using?
Have you updated the firmware lately?
resetting the WDTV by using the side button
resetting to factory defaults using the internal menu
unplugging the unit from the power for some minutes.
Do all 3 things one after the other before attempting to use the unit again.
As Mike says its always best to get things working without passwords in the first place, they tend to make any troubleshooting difficult. If you have no user name or password then its just a simple case of leaving everything at its default and pressing OK to connect.