After booting Windows 7 and selecting user account, screen goes black Tech Support

After booting Windows 7 and selecting user account, screen goes black

for some reason after the pc boots and it comes to the windows log on, I click user and my screen goes black and windows doesnt load up.
It stays black, then an error came up that said Wireless Configuration- Notification dll has not been registered, program
will not work correctly.
I clicked ok on the error and nothing is happening.
Just a black screen.
Any suggestions?
*original title - On Win 7 After I click my Username at startup my screen goes black and windows dont come up*

Anwsers to the Problem After booting Windows 7 and selecting user account, screen goes black

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