Unattended Re-install Of SQL Server 2005 Express Fails To Re-create Database!

Hi,

I have a script that performs an unattended installation of SQL Server and works fine.

However, if I un-install via the control panel all the files are removed apart from the databases that are created by me when SQl server was installed. This is good and ensures data is not deleted.

The files left over are in the following directory:
C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLData
and contains:
MyDatabase.mdf
MyDatabase_log.LDF

The problem I have is after performing the re-installtion of SQL server (unattended) I am unable to create a new database with the same name (in this instance called "myDatabase").

The actual files are physically there so this is the reason a new database with the same name cannot be creacted.

Again this is ok again because it ensures I cannot overwrite existing data. However I am unable to re-attach this database to SQl server so I can continue to use it!

The question is:

How do I make this database usable again after an unattended install? Is there a parameter I am missing?

Below are the commands I use that are passed to the installation of SQL Server as command line parameters:

#define SQL_SILENT "-q /passive /norebootchk /qn reboot=ReallySuppress"
#define SQL_USERNAME "username=MyUserName"
#define SQL_COMPANYNAME "companyname=MyCompanyName"
#define SQL_ADDLOCAL "addlocal=ALL"
#define SQL_DISABLENETWORKPROTOCOLS "disablenetworkprotocols=0"
#define SQL_INSTANCENAME "instancename=MSSQLSERVER"
#define SQL_SQLAUTOSTART "SQLAUTOSTART=1"
#define SQL_SECURITYMODE "SECURITYMODE=SQL"
#define SQL_SAPWD "SAPWD=#Password#"
#define SQL_SAVESYSDB "1"
#define SQL_USESYSDB ""
#define SQL_INSTALLSQLDIR ""
#define SQL_INSTALLDATADIR ""

#define SQL_PARAMETERS SQL_SILENT + " " + SQL_USERNAME + " " + SQL_COMPANYNAME + " " + SQL_ADDLOCAL + " " + SQL_DISABLENETWORKPROTOCOLS + " " + SQL_INSTANCENAME + " " + SQL_USESYSDB + " " + SQL_INSTALLSQLDIR + " " + SQL_INSTALLDATADIR + " " + SQL_SAVESYSDB + " " + SQL_SQLAUTOSTART + " " + SQL_SECURITYMODE + " " + SQL_SAPWD


The last four commands I have played around with but for some reason SQL Server service will not start when these are used! (This is a different issue though!).


Any advice would be gratefully accepted.

Thanks

Paul