Unhandled exception: privileged instruction in 16-bit code

[Max]

Installing an app (Autocad 2000), which has an InstallShield installer, all 
goes good up to end of file copying, an then an access violation appears :

Unhandled exception: privileged instruction in 16-bit code (0417:09b7).                                                 
In 16-bit mode.                                                                                                         
0x0417:0x09b7: ldsw     0x014a,%dx

A trace with --debugmsg +relay leads to following :

080ce9a8:Call KERNEL.74: OPENFILE(04370000 
"C:\\WINDOWS\\_INS33IS._MP",041f:1610,0200) ret=0417:0213 ds=041f
080ce9a8:Ret  KERNEL.74: OPENFILE() retval=ffff ret=0417:0213 ds=041f
080ce9a8:Call KERNEL.74: OPENFILE(04270000 
"C:\\WINDOWS\\_delis43.ini",041f:1610,0200) ret=0417:0229 ds=041f
080ce9a8:Ret  KERNEL.74: OPENFILE() retval=0001 ret=0417:0229 ds=041f
080ce9a8:Call KERNEL.74: OPENFILE(042f0000 
"C:\\WINDOWS\\_iserr31.ini",041f:1610,0200) ret=0417:023f ds=041f
080ce9a8:Ret  KERNEL.74: OPENFILE() retval=ffff ret=0417:023f ds=041f
080ce9a8:Call USER.111: SENDMESSAGE(ffff,c010,0000,00000000) ret=0417:0250 
ds=041f
080ce9a8:Call ntdll.RtlAllocateHeap(40240000,00000000,00000080) ret=407e0b60
080ce9a8:Ret  ntdll.RtlAllocateHeap() retval=40279b28 ret=407e0b60
080ce9a8:Call kernel32._ConfirmSysLevel(40837c08) ret=407e08cd
080ce9a8:Ret  kernel32._ConfirmSysLevel() retval=00000000 ret=407e08cd
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32.GlobalLock16(000003e7) ret=407d83ed
080ce9a8:Ret  kernel32.GlobalLock16() retval=402952d8 ret=407d83ed
080ce9a8:Call kernel32.GlobalLock16(000003e7) ret=407d83ed
080ce9a8:Ret  kernel32.GlobalLock16() retval=402952d8 ret=407d83ed
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32.HeapValidate(40c20000,00000000,40c2050a) ret=407e80ed
080ce9a8:Ret  kernel32.HeapValidate() retval=00000000 ret=407e80ed
080ce9a8:Call kernel32.HeapValidate(40c20000,00000000,40c20518) ret=407e8108
080ce9a8:Ret  kernel32.HeapValidate() retval=00000001 ret=407e8108
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32._ConfirmSysLevel(40837c08) ret=407e08cd
080ce9a8:Ret  kernel32._ConfirmSysLevel() retval=00000000 ret=407e08cd
080ce9a8:Call kernel32.wine_call_to_16_regs_short(412d26b0,0000000a) 
ret=407e7f97
080ce9a8:CallTo16(func=0417:0258,ds=041f,002a,c010,0000,0000,0000) 
ss:sp=041f:15d6 ax=041e bx=0000 cx=0000 dx=0000 si=0000 di=0000 bp=1600 
es=041f fs=0000
080ce9a8:Call USER.107: DEFWINDOWPROC(002a,c010,0000,00000000) ret=0417:03d0 
ds=041e
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Call kernel32._EnterSysLevel(40837c08) ret=407df5ef
080ce9a8:Ret  kernel32._EnterSysLevel() retval=400dbb90 ret=407df5ef
080ce9a8:Call kernel32._LeaveSysLevel(40837c08) ret=407df60f
080ce9a8:Ret  kernel32._LeaveSysLevel() retval=00000000 ret=407df60f
080ce9a8:Ret  USER.107: DEFWINDOWPROC() retval=00000000 ret=0417:03d0 ds=041e
080ce9a8:RetFrom16() ss:sp=041f:15d6  ax=0000 bx=0000 cx=0000 dx=0000 bp=1600 
sp=15d6
080ce9a8:Ret  kernel32.wine_call_to_16_regs_short() retval=412d26b0 
ret=407e7f97
080ce9a8:Call kernel32.GlobalLock16(000003e7) ret=407d83ed
080ce9a8:Ret  kernel32.GlobalLock16() retval=402952d8 ret=407d83ed
080ce9a8:Call ntdll.RtlFreeHeap(40240000,00000000,40279b28) ret=407e515a
080ce9a8:Ret  ntdll.RtlFreeHeap() retval=00000001 ret=407e515a
080ce9a8:Ret  USER.111: SENDMESSAGE() retval=00000001 ret=0417:0250 ds=041f
wine: Unhandled exception, starting debugger...

Regards

Max