Solution : https://service.sap.com/sap/support/notes/138208 (SAP Service marketplace login required)
Key words : 
oracle upgradei/ important general remarks------------------<d020432 02/feb/99>-------------------------dec-alpha, \hkey_local_machine\software\oraclenls_lang\hkey_local_machine\software\oracle\home0nls_langboth, --------changed----------<d019144 28/aug/98>--------------------------------------------------<d020904 06/aug/98>--------------------------------------------------<d020904 22/jul/98>-------------------------, enhancement system table space22/jul/98 ii/  nt, migration/upgrade procedure additional key words orainst, check nls_lang registry entriesafter applying oracle patch 8, svrmgr> startup mountsvrmgr> alter database archivelog, 2\win32\installthe 'software asset manager' window, nt start menu start -> programs -> oracle, /   important general remarks    ii/  correction
Related Notes : 
       
| 124641 | Additional ORACLE migration/upgrade to 8.0.4 Japan | 
| 112325 | End of "Cust. Care Support" ORACLE 7.3.* | 
| 110342 | Additions for ORACLE Migration/Upgrade to 8.0.4 | 
| 99311 | Current patch set 8.0.4.X | 
| 98228 | Transp. after database upgrade to Oracle 8.0 and 8.1 | 
| 95999 | Additional Info: Upgrading to 4.0B ORACLE | 
| 92779 | Problems during the migration to 8.0.X |