exit code 1603

When I tried to install a software using protected BDP, it appears this error. Anyway I can see it downloaded the files. What does this error mean?

Raised Program Started Event for Ad:TST20030, Package:TST00012, Program: DE 13/1/2010 5:08:19 PM 588 (0x024C)
Product not installed {781EECEB-08B8-4E74-96CB-3EE13459963E} execmgr 13/1/2010 5:09:01 PM 3756 (0x0EAC)
Program exit code 1603 execmgr 13/1/2010 5:09:41 PM 3756 (0x0EAC)
Looking for MIF file to get program status execmgr 13/1/2010 5:09:41 PM 3756 (0x0EAC)
Script for Package:TST00012, Program: DE failed with exit code 1603 execmgr 13/1/2010 5:09:41 PM 3756 (0x0EAC)
Raising event:
[SMS_CodePage(437), SMS_LocaleID(1033)]
instance of SoftDistProgramErrorEvent
{
 AdvertisementId = "TST20030";
 ClientID = "GUID:2DC8EC30-29D3-49FA-91F3-2A1E4C0B0CB2";
 DateTime = "20100113090941.289000+000";
 ExitCode = "1603";
 MachineName = "Test123";
 PackageName = "TST00012";
 ProcessID = 2636;
 ProgramName = "DE";
 SiteCode = "TST";
 ThreadID = 3756;
 UserContext = "NT AUTHORITY\\SYSTEM";
};
 execmgr 13/1/2010 5:09:41 PM 3756 (0x0EAC)
Raised Program Error Event for Ad:TST20030, Package:TST00012, Program: DE execmgr 13/1/2010 5:09:41 PM 3756 (0x0EAC)
Execution is complete for program DE. The exit code is 1603, the execution status is FailureNonRetry execmgr 13/1/2010 5:09:41 PM 3780 (0x0EC4)