Mike, Thanks for your reply. The modal analysis runs but reaches a point where it says it can't calculate the next frequency. Then, when I run the time history it says my time step is not small enough. When I manually enter a smaller time step the program gives me a warning saying to close other software that I don't have enough memory allocated. I have all other programs off but can't get rid of this warning and it won't allow the time history analysis to run. Roger
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