Why wont my laptop allow me to log in even though i know this is the right password how can i log in

[Cindy_42]

Why can i not use my password to access my acer laptop even though its the right password

 

[rgd1101]

Which OS? What is the exact error?

 

[rgd1101]

MERGED QUESTION
Question from Cindy_42 : "Loking for help"

I have a acer laptop but i cant log in even though i know its the right password how can i sort this out