Error when trying to delete user

I created many test users in my application while trying to get a custom registration process to work, and now I would like to delete those users so they don't use up space in my database. When I go into the aspnet_Users table and try to delete a user, it gives me the following error:

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DELETE statement conflicted with COLUMN REFERENCE constraint 'FK__aspnet_Me__UserI__0F975522'. The conflict occurred in database 'DB_83996', table 'aspnet_Membership', column 'UserId'.

DELETE FROM [DB_83996].[dbo].[aspnet_Users] WHERE 1=0 OR ( [UserId] = '{7E864A07-6FE8-46EF-A2B8-354646D57C76}' )

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I don't know much about SQL statements, so is that statement it gave me the statement I need to use to delete that particular user? If not, how would I go about deleting these users I don't need anymore?

Thanks so much. :)

your table "aspnet_Membership" contains records that reference the user record you are trying to delete.

you will need to delete those records first.

|||Thanks. I could have sworn I tried that before because I knew those two tables were linked. Maybe it was something else I tried. Oh well. Thanks!!

Error setting up Custom Security Extension

I am trying to set up a custom security extension. I've followed the setup
from the msdn article as well as the Microsoft Reporting Services in Action
sample. I keep getting an error when I try to start the ReportServer Service
after changing the config file. Can anyone help?
Thanks in Advance!
P.S. I looked in the log file and this looks like the first error:
ReportingServicesService!library!4!6/28/2005-16:21:10:: i INFO: Counter not
created. Category: RS Windows Service, Counter: Active Database Connections,
Instance: MSSQLSERVER. Error Message: Counter 'active database connections'
does not exist in category 'rs windows service'.Scott,
here I will suggest to restore original config files and reconfigure
them. Else please send me file, I will try to fig out the problem.
Mahesh