Hi Stan,
Virtual RAM is too slow for Hauptwerk. The basis for the Hauptwerk Sample Sets is to have all of the pipe .WAV files in RAM and only in RAM. Solid State drives, memory sticks (CMOS) are still too slow for Hauptwerk and even after they are fast enough the buss speed of the R/W is still going to be an issue (too slow).
My recommendation would be either a new computer or new mother board and CPU with at least 8 RAM slots and an 8 core processor and all the drives would be SSDs. That should be pretty easy to do for a computer shop.
Best regards,
Thomas
edit: It might be possible to put 8GB or 16GB simms in your present motherboard which could increase your RAM.