Hi I will appreciate any help in this direction My server got crashed and I did follow the Microsoft web site for recovery. The problem was 27 days ago I removed a domain controller and today I found that recipient update service was still looking for that machine and I got in trouble not allowing me to change. I tried resetting the mail computer account and using recovery switch, but I got stock in foretprep part and tells me that, "Setup failed to install subcomponent oxc103798a.." I have checked all Microsoft knowledge base and no luck. Also this is a part of log [04:49:09] Interpreting line <CreateProcess:d:\setup\i386\exchange\bin;regsvr32.exe /i /n /s maildsmx.dll;4294967295> -- ID:31259 -- [04:49:09] Process created ... waiting (-1) [04:50:41] Process has exited with 0x000005 [04:50:41] The command regsvr32.exe /i /n /s maildsmx.dll failed, returning error code 5 (Access is denied.). -- ID:31136 -- ScCreateProcess (f:\titanium\admin\src\libs\exsetup\hiddenw1.cxx:1821) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] CInsParser::ScProcessLine (f:\titanium\admin\src\libs\exsetup\hiddenw1.cxx:1225) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] Processing file 'd:\setup\i386\exchange\schema.ins', at or near line 8 (CreateProcess:d:\setup\i386\exchange\bin;regsvr32.exe /i /n /s maildsmx.dll;4294967295) -- ID:31111 -- CInsParser::ScProcessLine (f:\titanium\admin\src\libs\exsetup\hiddenw1.cxx:492) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] Registry file name: 'd:\setup\i386\exchange\schema.ins' CRegistryManager::ScProcessFile (f:\titanium\admin\src\udog\setupbase\tools\regmgr.cxx:125) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] Filename = 'd:\setup\i386\exchange\schema' CBaseAtom::ScAddRegistryKeys (f:\titanium\admin\src\udog\setupbase\basecomp\baseatom.cxx:1408) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] CAtomSchema::ScAddRegistryKeys (f:\titanium\admin\src\udog\exsetdata\components\root\a_schema.cxx:318) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] Leaving CAtomSchema::ScAddRegistryKeys [04:50:41] CAtomSchema::ScAdd (f:\titanium\admin\src\udog\exsetdata\components\root\a_schema.cxx:150) Error code 0XC103798A (31114): An internal component has failed. [04:50:41] Leaving CAtomSchema::ScAdd [04:50:41] mode = 'Install' (61953) CBaseAtom::ScSetup (f:\titanium\admin\src\udog\setupbase\basecomp\baseatom.cxx:842) Error code 0XC103798A (31114): An internal component has failed.