MaxDB on 64-bit machine

I installed the MaxDB 7.6.03.16 on 64 bit machine. The installation process was quick and silent. But then I tried to create new instance - I got some error: "-24875 The operating system user is not member of database administrators group \[db_create.....\]". I am administrator on this machine. The machine has WinXP Professional x64 Edition Version 2003 bit SP1, I tried to create instance from "Database Manager". My question is: That is a database administrators group? How may I add current user to this group? Why it's not happens on 32 bit machine? Thanks a lot.

Edited by: Pavel Melech on Dec 17, 2008 6:22 PM