Whenever I try to turn SQX on my Win7 x64 machine, sooner or later it crashes/exits. There are no error messages before exiting but the log file shows Java problems.
This happens on both Win7 x64 machines I have licenses for but not on my Win10 x64 machine.
We don't receive any similar reports form other users.
So try to check your RAM memory using some tool.
You can also try a different Java version:
- download JDK from this link: https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.4%2B11/OpenJDK11U-jdk_x64_windows_hotspot_11.0.4_11.zip
- rename folder /j64 in SQ installation to /j64_old
/ unzip the downloaded ZIP there and change its name to j64.
This will make SQ use OpenJDK Java instead of Java from Azul.
But I still think it is a bad memory problem in your case.