Physical memory dump on Memory upgrade

M/B MSI K7T Ultra ARU original memory 512 PC 2100 DDR. O/S Windows 2000 SBS. HD Quantum Fireball AS 20BG [O/S partition 6.0 GB].
Question: Upgraded amount of memory from 512MB to 768MB using Kingston value ram. After installation of dimm and startup, Windows began a physical memory dump to disk. This dump creates low HD freespace for virtual memory resulting in pagefile resize.

Question: How to get windows to recognize and use the additional 256MB above 512MB.