Thanks guys.
An interesting problem - the server I am trying to install the client on is a DL580 G5 that is running Windows 2003 Standard 64 bit edition.
However, when I try and install the 64 bit Netbackup software, I receive a message stating that this application cannot run using the processor type of the machine.
Conversely, when I try and install the the 32 bit client, it seems to start ok.
Can anyone see any reason for this? From what I can see from the Hp site, this particular model of hardware has 64 bit processors, so I would have thought that the 64 bit client should have installed.
Thanks