How to make a copy from a Emergency Database?
The import/export wizard doesn't copy a lot of stuff, the identity property on columns is just one of the things that it doesn't copy.

If you don't have a functional backup you'll want to manually script out all the objects from the database first, then copy the data using the import/export wizard.

Once your new database is up and running you'll want to look at setting up regular database backups so that if this happens again the database can just be restored from the backups.

You should also keep in mind that SQL Server 2000 has been end of lived and all support for the product is gone.  Upgrading to a newer version of SQL Server would be a good idea.