If when installing SolidWorks, Microsoft SQL Server fails to install, first change block sizes and the instance name and see. More solutions here.

If you run into a 500 internal server error, you might want to try a few troubleshooting steps to see if the problem can be resolved. Close the browser or restart your computer.

Seeing this message can be annoying when you're trying to get onto a website What is a 500 internal server error?