Can't login to Windows 7 Ultimate because password keeps automatically filling with the dots and I can't erase?

[Microsoft Windows]

Upon startup of Windows 7 Ultimate, the password box automatically fills with the dots. I try to use backspace to delete to no avail. I tried selecting all by right clicking and nothing. I can't erase dots to enter my password. I tried to Repair my Computer but I can't because it needs the password to be enter and it does the same thing as the login. I can't erase dots to e ter password. Please help. I was working a few weeks ago. This computer doesn't get used very often.

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