Marco,
The Technote that you have mentioned states that Veritas Replication Exec (VRE) will not install on 64-bit architecture. This means hardware or software. The information on the technote discusses setting the hardware to be in 32-bit emulation and then installing a 32-bit Operating System on that. If VRE sees the hardware as supporting 32-bit and the OS it is being installed into is also 32-bit, it will allow the software to install, otherwise you will get the error seen. In your case you mention that you are attempting to install in Windows 2003 64-bit, which is unsupported OS platform.
Unfortunately Veritas Replication Exec 3.1 is an older product that was never designed to be run on 64-bit operating systems, due to the 32-bit filter drivers involved and will generate errors if this is attempted.
_____________________________________________
If this is solution to your issue, please mark it as such.
