Unfortunately I have been unable to find any current documentation on that error, so I can't tell for sure whether upgrading the memory will resolve your issue. So let's go back to some basics and build from there.
1. Does this controller have a fresh install? That is, does it have a lot of software already installed, or are you just installing software piece by piece?
2. If it's not a fresh install, how possible would it be to make it so? To reimage the machine?
3. In addition to setting the software back to a clean state, have you tried setting all the controller's jumpers, switches and other settings are set to the default values? (See chapter 3 of
NI-VXIpc-800/700 User Manual)
If we can get the controller back to a known good state then hopefully we can get T&M Explorer and NI-VXI installed and have the error taken care of.
Also, while 32MB of RAM is not a lot of RAM, at one time these controllers were sold with no more that 16MB of RAM, so 32MB should be enough for the system to work, though neither 16MB nor 32MB of RAM will make the system as fast as 64MB or 128MB might.
Finally, you mentioned that you are looking into getting this to work as a spare. What's your end goal? Have you considered opting for a newer controller, whether embedded controller or remote controller? I'm just curious.
Logan S.