Solution : https://service.sap.com/sap/support/notes/1298737 (SAP Service marketplace login required)
Key words :
choose 'start'-> 'control panel' -> 'regional, program starter window, terms program starter, current format setting, user running sapinst, language formats settings, formats settings, language options', sapinst reason, sapinst windows
Related Notes :
| 1439013 | SAP Systems based on SAP NetWeaver 7.3: Windows |