Try the following a) and/or b) solution(s). If none of the solutions can solve the issue, please contact Microsoft support for further assistance about why System Writer is missing.

a)  Refer to http://technet.microsoft.com/en-us/library/cc734021(WS.10).aspx  and make appropriate changes to access control list on the %systemdrive%\Windows\registration folder if the situation matches the document.
   
b) Try to list permissions for the files in %windir%\winsxs\filemaps from a command prompt run as administrator. If access was denied to every file, run the following sequence of commands to reset the permissions and restore the state of System Writer:

      cd c:\windows\system32
      Takeown /f %windir%\winsxs\filemaps\* /a
      icacls %windir%\winsxs\filemaps\*.*  /grant "NT AUTHORITY\SYSTEM:(RX)"
      icacls %windir%\winsxs\filemaps\*.*  /grant "NT Service\trustedinstaller:(F)"
      icacls %windir%\winsxs\filemaps\*.*  /grant "BUILTIN\Users:(RX)"

H RahulG,

like I wrote in my post:
- I have allreday done all theses steps
- System writer IS PRESENT, (is NOT missing)

Nevertheless I get this error: CAPI2 - 513 : Cryptographic Services failed while processing the OnIdentity() call in the System Writer Object.

cheers
Dirk