Probably you have the wrong type of Java installed; if you install the 64-bits version of System Workbench for STM32, you must have the 64-bits version of the Java JRE or JDK installed. If you have the 32-bits version installed, the installer will not complain (as he does not know if your java is 32 ou 64 bits, as it works) but Eclipse will not be able to run.
If this is the problem, please remove all 32-bit versions of Java and install the latest 64-bits version of Java you need (JDK or JRE).
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