When installing the ConfigMgr client on Windows Server 2003 (R2) systems, there may be an error message in ccmsetup.log (Windows\ ccmsetup\ Logs folder). This because prerequisites are not in place to succesfully install the client.
-Failed to query BITS 2.5 interface with error 0x8004002
-This operating system does not contain the correct version of BITS. BITS 2.5 or later is required.
-CcmSetup failed with error code 0x80004002
Just install Background Intelligent Transfer Service (BITS) 2.5 for Windows Server 2003 (KB923845) to solve the issue. The hotfix can be found on the following location: Download Center
After that install the ConfigMgr client will be fine.