I'm also getting bombarded with "disk full while accessing H:\CancelSolverMenuStudy 2 No Holes.dat" halfway through and don't know how to fix it so that i can continue.
I'm not familiar with Simulation, so I don't know if there is a nice setting that will give you the acceleration at any point, but I can think of possible work-arounds. You could add a small test mass body at the points of interest, then look at the stresses at the interface to the real model to get the forces in the principal directions. Compare the forces to the weight of the model and you get the acceleration. If Simulation has spring elements, then you could mount the test mass with them, which would make getting the forces easier, assuming that it will give you the reaction force for the spring.
You cna just pick a node and plot the quatity you want as a function of time - hunt around a bit in the probe command.