From IBM
Answer
The resolution for both messages is the same as mentioned in the Release Notes Page 15:
"Errors during installation on Windows 2003 64-bit"
The resolution for this issue is:
To ensure a successful installation, apply the Windows patch to the server before attempting to install Cognos Express:
WindowsServer2003.WindowsXPKB942589-x64-ENU.exe
Detail Link :
http://www-01.ibm.com/support/docview.wss?uid=swg21462406