If you are going to install Enterprise Portal again, you must drop the database devices portalData, and portalLog. To drop these database devices:
From a command prompt, enter:
isql -Usa -P -S<servername>
where <servername> is the name of the machine where you installed Enterprise Portal.
At the 1> prompt, enter:
sp_dropdevice portalData go sp_dropdevice portalLog go
