I'm installing SQL Express as part of my project. Normally the installation goes fine. However SQL Express won't install on Win 7 OS that doesn't have SP2 installed.

When I run my SB 8.1 project the install fails and doesn't flash the error message telling you to install the SP. Is there a way to force this message?

script:
%MY_INSTFOLDER%\SQLEXPR_x86_ENU.exe /ACTION=Install /FEATURES=SQL /INSTANCENAME=DataBinder /SQLSVCACCOUNT="NT AUTHORITY\LOCAL SERVICE" /IACCEPTSQLSERVERLICENSETERMS=True /NPENABLED=1 /TCPENABLED=1 /ADDCURRENTUSERASSQLADMIN /QS

Thanks.