User account access

I cannot log into my user account in Vista. When I click on my account it
just brings up a blank (black) screen. I can ctrl alt dlet and log off. I can
get into another (Administrator level) login on the same computer. I tried to
move the computer back a couple od days but it will not let me do that
either.
I created another Admin level user account and when I tried to log into that
it just brings up a blank (blue) screen. I may have "locked" myself out of my
own user account?

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raftnfool