Problem with restore of a comapany / SQL

I have a problem with the restore of a company on a sql server. When I try to make the restore the Navision client simply abort without showing me any error message. It is a Attain 360, 150 GB database on a SQL2000 with 35 companies. I have even tried to delete a (test)company in the database and tried to restore it again without success. I have tried directly ON the Navision/SQL-server with a database owner user with SUPER Navision-permission. The same company has been restored with succes into a test-SQL-server. Any suggestions? Kristoffer