You should check Windows not hardware http://www.jrsoftware.org/ishelp/index.php?topic=isxfunc_iswin64

>Using innosetup for the setup procedure, I need to run a file after setup, depending on 32bit or 64 bit OS. I
tried a few flags to check if the OS is 64 bit, but Innosetup seems to ignore those:
>

>[Code]
>function IsX64: Boolean;
>begin
>  Result := (ProcessorArchitecture = paX64);
>end;
>
>[Files]
>; MsSql client:
>Source: "..\Resources\SQLRuntimeFiles\sqlncli.msi"; DestDir: "{tmp}"; Components: CompleteClient; Check: not IsX64
>Source: "..\Resources\SQLRuntimeFiles\sqlncli_x64.msi"; DestDir: "{tmp}"; DestName: "sqlncli.msi"; Components: CompleteClient; Check: IsX64
>
>[Run]
>Filename: {sys}\msiexec.exe; Parameters: /i {tmp}\sqlncli.msi; WorkingDir: {tmp}; StatusMsg: Installing SQL Server Native Client Drivers.; Flags: runascurrentuser;
>

>It looks like it ignores the check and always copies both files. So when running the resulting setup.exe on a 32bit OS it gives the error message that it is not supported. What am I missing here?