Login failed for user ‘sa’

Notthing is more frustrating then an installation where occur errors.
I got the following error:
Login Failed for User ‘sa’, Not Associated with a trusted SQL Server Connection.

Guess what, I’m working on a developer notebok of our customer and mixed authentation mode wasn’t allowed.
The solution is quite easy to find using Google: http://www.banmanpro.com/support/sql2k.asp