thanks everyone i find out wat the problem already the correct comman line is "%wpipath%Install\April Update\Q901190.exe" /Q i need to add " " then it only work and yes i was using 5.0 and this is the success log WPI Installation Log File Install process started at: Wednesday, June 28, 2006 12:38:13 AM List of programs to be installed: Q901190 ----- Wednesday, June 28, 2006 12:38:14 AM Program: Q901190 UID: Q901190 Order: 900001 Category: April Update Patch Wednesday, June 28, 2006 12:38:31 AM cmd1 Success (returned code 0): ""C:\Documents and Settings\ChunKit\Desktop\test\Install\April Update\Q901190.exe" /Q" Wednesday, June 28, 2006 12:38:31 AM Finished installation ----- Install process finished at: Wednesday, June 28, 2006 12:38:31 AM but i dun understand y i need to add the " " then only can add switches but example config there no need but it work for silent install