Thank you for your post.
I am able to install FileMaker Server 13.0v1 on my Windows 7 Professional (64-bit) computer without issue.
What are the full system specifications for the computer?
After a significant amount of time with Filemaker customer service, it turns out the uninstaller for Server 12 did not completely uninstall version 12. I had to explore multiple locations for files. I also had to uninstall Java and a few other items that v12 installed and let v13 reinstall them. While the end result is I was able to install and configure v13 the lack of ANY message from the installer as to what the problem might be is discouraging. This is too expensive a program to leave you guessing and unable to get past this silent failure.