Named and default instance in SQL Server 2k

Hi,

I am trying to create a DB in a instance of sql server 2k. But the problem is, i have two instances, one default and the other named instance. So when i create a db in default instance, the same is getting
created automatically in named instance. Same happens when i try to do this in named instance. I mean both are acting like mirror instances. Can anyone try to sort this out.

thanks in advance,
bobbyWhat are the names of both instances?
Check SQL Error log for any information. Have you installed named instance seperately or tried a mirrored copy.