Memory management

On a PII 350MHz, machine with 64 MB RAM, what would be the best way to optimize memory. Should I let Windows manage my virtual memory or should I set values. My only problem is that if I set values, what should I set the virtual memory settings to?? The reason I ask is because I have a client who is working with a spreadsheet on a machine like above, and she keeps getting the “Not Enough Memory” error message. Obviously a simple solution is to add more memory, but I unfortunately do not have control over that in the company that I work for. Ideas???