I understand you are unable to access your Windows 8 system due to the password.
A password reset disk would have needed to be made as it's not something that can come with the system due to the nature of how account setups work. This guide details how to make one in Windows 8 should you want to make one in the future.
Has it always asked for a password and it worked up until now or is this the first time that it started prompting for a password?
If it is a new development, you could try a restore to a date before the issue happened.