Hi. Adrian.
Check the following link. Although it is about Transact-SQL Debugging, but
it will help you.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/trblsql/tr_serv
tools_5cfm.asp
And I heard that some Microsoft security patch affect your machine (rumor?)
Good luck

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Blogs (http://seaousak.egloos.com)
Microsoft 2002 ~ 2004 .NET MVP
> I'm getting the following error when I try to run a
> simple windows application .Net project in VS .Net 2003
[quoted text clipped - 15 lines]
> problems, then all of a sudden this problem popped up. I
> think I must have changed some setting on my machine...