Solution : https://service.sap.com/sap/support/notes/511522 (SAP Service marketplace login required)
Key words : 
rare program terminations corrected sap front-end setup patch level 20, bw front-end patch sap front-end setup patch level 14, sapadmin title display error sap front-end setup patch level 19, solved sap front-end setup patch level 23new version, delete package sap front-end setup patch level 13, progress dialog sap front-end setup patch level 21, hklm\software\microsoft\windows\currentversion\app paths, asian characters sap front-end setup patch level 11, elipses sap front-end setup patch level 17, server registration sap front-end setup patch level 12
Related Notes : 
       
| 535308 | How to apply a SAP Front End patch? | 
| 521847 | SAP MAPI: Error after installation of SAP Frontend 6.20 | 
| 512040 | Distributing "services", "saplogon.ini", and similar files. | 
| 508649 | Diagnosis of frontend installation problems | 
| 496989 | BW 3.0B front-end patch 2 | 
| 456905 | Composite SAP note about SAPSetup as of Release 6.20 | 
| 361222 | SapPatch: Importing GUI Patches | 
| 96885 | Downloading front end patches |