Solution : https://service.sap.com/sap/support/notes/373326 (SAP Service marketplace login required)
Key words : 
profile parameter                    em/reserve_mapping_window = onin, terms address space fragmentation reason, error => <esnt> block 178/28769608 virtualalloc error=487, extended memory basis address predefined, reserved address space area, address space fragmentation, basis address predefinition, address space consistency, dialog queue standstill, developer trace files
Related Notes : 
       
| 544533 | FAQs: The R/3 system no longer starts | 
| 307976 | PXA_NO_SHARED_MEMORY | 
| 129813 | Windows: Problems due to address space fragmentation |