When you install inFlow, Microsoft SQL Server 2005 (backend database for inFlow) is installed during the process. In some cases, a computer does not wish to install SQL Server 2005 and in these very rare cases we suggest attempting to install SQL Server 2008 R2. If you have not already please try installing 2008 by following the steps in Option 1 here. If that didn’t work, please follow the steps below:
0) You should uninstall inFlow first and more specifically, any remaining SQL Server parts. Follow the Clean Up guide here.
1) Download SQL Server Express (with the language for your Windows) from Microsoft. Be sure to choose the correct installer for your bit type.

2) Install the downloaded file.
2a) Choose New Installation or add features to an existing installation.

2b) Accept the license terms and click Next.

2c) For Instance Name, select Named instance, and specify the name (all capitals): INFLOWSQL

2d) Click next through Server Configuration

2e) For Database Engine Configuration, choose Mixed Authentication (or SQL Server Authentication).
For password, choose any password and write it down.

2f) Click Next through Error Reporting

3) If there are no errors or you’ve fixed them, the Microsoft SQL Server install is complete.
You should be able to continue to installing inFlow. Download inFlow from our website and install it. It might prompt you to reset the database password, and in that case just set it to the one you used in Step 2e.
If you still have problem launching inFlow, please search or ask for a solution from our online forum.