Hi,
What does the error message say when you check the Application log in the Event Viewer?
You could be facing a permissions issue: before you run the BizTalk installation, make sure that you create these four groups on the database server where the BizTalk databases will be created (BizTalk Server Administrators, BizTalk Server Operators, BizTalk Application Users, BizTalk Isolated Host Users) and make sure that the user account you are using to configure BizTalk Server is also a member of the aforementioned groups…
Daniel.