Q: "What should I do if I cannot access the Windows Installer service when I install the XX software?" & rdquo; After a few efforts, I found the correct solution, as follows: Copy the following italicized text into Notepad and save it as .reg format, double-click to import. Restart Vista after importing. Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\msiserver] "DisplayName"="@%SystemRoot%\\\\system32\\\\msimsg.dll,-27" "ImagePath"=hex(2):25 ,00,73,00,79,00,73,00,74,00,65,00,6d,00,72,00,6f,00,6f,00,\\74,00,25,00,5c, 00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6d,\\ 00,73,00,69,00 ,65,00,78,00,65,00,63,00,20,00,2f,00,56,00,00,00 "Description"="@%SystemRoot%\\\\system32\\\\msimsg. Dll,-32" "ObjectName"="LocalSystem" "ErrorControl"=dword:00000001 "Start"=dword:00000003 "Type"=dword:00000010 "DependOnService"=hex(7):72, 00,70,00,63,00,73,00,73,00,00,00,00,00 "ServiceSidType"=dword:00000001 "RequiredPrivileges"=hex(7):53,00,65,00 , 54,00,63,00,62,00,50,00,72,00,69,00,76,\\ 00,69,00,6c,00,65,00,67,00,65,00, 00,00,53,00,65,00,43,00,72,00,65,00,61,00,\\74,00,65,00,50,00,61,00,67,00,65 ,00,66,00,69,00,6c,00,65,00,50,00,72,00,69,\\ 00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,4c,00,6f,00,63,00, \\ 6b,00,4d,00,65,00,6d,00,6f,00,72,00,79,00,50,00,72,00,69,00,76,00,69,00,6c , \\ 00,65,00,67,00,65,00,00,00,53,00,65,00,49,00,6e,00,63,00,72,00,65,00,61, 00, \\ 73,00,65,00,42,00,61,00,73,00,65,00,50,00,72,00,69,00,6f,00,72,00,69,00 ,74,\\ 00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00, 53,00,\\ 65,00,43,00,72,00,65,00,61,00,74,00,65,00,50,00,65,00,72,00,6d,00,61 ,00,6e,\\ 00,65,00,6e,00,74,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67, 00,65,00,\\ 00,00,53,00,65,00,41,00,75,00,64,00,69,00,74,00,50,00,72,00,69,00 ,76,00,69,\\ 00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,53,00,65,00,63,00, 75,00,72,00,\\69,00,74,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67 ,00,65,00,00,\\ 00,53,00,65,00,43,00,68,00,61,00,6e,00,67,00,65,00,4e,00,6f, 00,74,00,69,00,\\66,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00 ,65,00,00,00,53,\\ 00,65,00,50,00,72,00,6f,00,66,00,69,00,6c,00,65,00,53,00, 69,00,6e,00,67,00, \\ 6c,00,65,00,50,00,72,00,6f,00,63,00,65,00,73,00,73,00,50,00,72,00,69,00,76 , \\ 00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,49,00,6d,00,70,00,65, 00, \\ 72,00,73,00,6f,00,6e,00,61,00,74,00,65,00,50,00,72,00,69,00,76,00,69,00 ,6c,\\ 00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,61,00,74,00, 65,00,\\ 47,00,6c,00,6f,00,62,00,61,00,6c,00,50,00,72,00,69,00,76,00,69,00,6c ,00,65,\\ 00,67,00,65,00,00,00,53,00,65,00,41,00,73,00,73,00,69,00,67,00,6e, 00,50,00,\\72,00,69,00,6d,00,61,00,72,00,79,00,54,00,6f,00,6b,00,65,00,6e,00 ,50,00,72,\\ 00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00, 52,00,65,00,\\73,00,74,00,6f,00,72,00,65,00,50,00,72,00,69,00,76,00,69,00,6c ,00,65,00,67,\\ 00,65,00,00,00,53,00,65,00,49,00,6e,00,63,00,72,00,65,00,61, 00,73,00,65,00,\\ 51,00,75,00,6f,00,74,00,61,00,50,00,72,00,69,00,76,00,69,00 ,6c,00,65,00,67,\\ 00,65,00,00,00,53,00,65,00,53,00,68,00,75,00,74,00,64,00, 6f,00,77,00,6e,00,\\ 50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00 ,00,53,00,65,00,54 , \\ 00,61,00,6b,00,65,00,4f,00,77,00,6e,00,65,00,72,00,73,00,68,00,69,00,70, 00, \\ 50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00 , 4c, \\ 00,6f,00,61,00,64,00,44,00,72,00,69,00,76,00,65,00,72,00,50,00,72,00, 69,00,\\76,00,69,00,6c,00,65,00,67,00,65,00,00,00,00,00 "FailureActions"=hex:84,03,00,00 ,00,00,00,00,00,00,00,00,03,00,00,00,14,00,00,\\ 00,01,00,00,00,c0,d4,01,00, 01,00,00,00,e0,93,04,00,00,00,00,00,00,00,00,00 [HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\msiserver\\Enum] "0"=" ;Root\\\\LEGACY_MSISERVER\\\\0000" "Count"=dword:00000001 "NextInstance"=dword:00000001