Help about create new database

[Cesar Augusto Duque Arroyave]

O.k. that´s the question,

I recently installed Mysql into this machine a wonderful pentium IV 2.8 HT Dell computer With 1 GB of RAM and Running (shame on me) WIN XP
Everything works fine while i work into the test database but as soon as i try to create a new one the mysql says:

"1044 access denied for user: @'localhost' to database 'mytest'"

o.k the problem is

i am the system administrator

i have the account permissions as system administrator not only in this machine but in the whole system, server and domain (o.k it is a windows one but anyway is a domain) i tried to log as every possible combination of users and domain or local machine names and nothing worked to me, does anyone have a clue about what am i doing wrong?

Thanks a lot