Help. "Unable to allocate Memory" error.

Hey all,

I tried a search first and I tried google.  I have to look at a PC tomorrow that has either CS5 or CS5.5, it's running Windows 7 64 bit with 16 GB of Ram.

The error being given is:

"Unable to allocate 0.000Mb of memory. Either decrease the memory requirements for the rendering of this frame

or install more RAM. (123803/U.Mem Tracked Object)"

And I have no idea.

I suspect it might be in the way he has AE set up but wont know until I see the machine.  Any suggestions appreciated.

Cheers