How to make geforce6100pm-m2 read both memory slots

Make sure your memory meets these guide lines.
? 2 x 240-pin DDR2 DIMM socket support up to 16 GB*
? * (Due to the DRAM maximum size is 2GB at present, the memory maximum size we have tested is 4GB)
? Dual-channel DDR2 memory architecture
? Support DDR2 800/667/533/400 DDR2 SDRAM
Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows?32-bit OS.
For Windows?64-bit OS with 64-bit CPU, there is no such limitation
which means win xp will only read 2gig and win vist/7 will read 4g so if you have 2x 2gig and only 1 is registering its working fine with win xp.
? 2 x 240-pin DDR2 DIMM socket support up to 16 GB*
? * (Due to the DRAM maximum size is 2GB at present, the memory maximum size we have tested is 4GB)
? Dual-channel DDR2 memory architecture
? Support DDR2 800/667/533/400 DDR2 SDRAM
Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows?32-bit OS.
For Windows?64-bit OS with 64-bit CPU, there is no such limitation
? 2 x 240-pin DDR2 DIMM socket support up to 16 GB*
? * (Due to the DRAM maximum size is 2GB at present, the memory maximum size we have tested is 4GB)
? Dual-channel DDR2 memory architecture
? Support DDR2 800/667/533/400 DDR2 SDRAM
Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows?32-bit OS.
For Windows?64-bit OS with 64-bit CPU, there is no such limitation