MySQL: ERROR 1227 (42000): Access denied - Cannot CREATE USER

I'm using MySQL 5.5.16 noinstall Zip Archive on Win7.

After I started the server, the command show databases showed me a list of 2 databases: information_schema and test. The latter is empty.

Where is the table user?

I tried to create a new user through this command create user newUser; and got the following error message: ERROR 1227 (42000): Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation

What should I do to create, databases, tables, and do all the operations I want to do? I don't know if the fact that I'm using MySQL 5.5.16 noinstall Zip Archive has something to do with the error message?