What is the user account's password, Why is most of the things in the reference manual does not work as stated?

[Varuna Seneviratna]

What is the user account's password.I used the command
C:\>mysql -u user -p
Enter password: **********
ERROR 1045 (28000): Access denied for user 'user'@'localhost' (using
password: Y
ES)
How can I find it?
Varuna