csharp & self extracting package

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C#

Windows

hi every one ,
i made project in c# and it contains 4 files :
selfintall.exe
sysdomino.exe
d.exe
as.dll
the file selfinstall.exe will copy files to :
sysdomino to "c:\windows\sysdomino.exe
d & as.dll to "c:\file\"
"file is directory and its exist before copy files"
so i made package by using builtin windows IExpress wizard
and choose selfinstall.exe as the "installprogram"

when i run the package the selfinstall window appears and when i pressed the buttom in selfinstall.exe to copy files it gave me errors :
"file couldn't be found " to files sysdomino.exe and as.dll but it copy the file d.exe

so any one can help me
i hope that i explained the problem in goodway