Tech question about RAM (mostly OT)

[bort411]

I'm looking for recommendations about how to best optimize my computer. Specifically, I want to increase the amount of physical memory my machine actually uses. When multitasking, my CPU usage is regularly at 100%, yet over three days of heavy use my peak commit charge is only 628,128 out of 4.5 million KB. My current setup is this:

Windows XP Professional
AMD 64 3200 CPU
1.5 GB of PC3200 RAM
10,000 RPM SATA HDD(OS is on this)
7,200 RPM SATA HDD
7,200 RPM IDE HDD (3GB Pagefile is on this)

I guess my questions are: should I reduce, move, or eliminate my pagefile since none of it needs to be used? Does anyone have any other suggestions to increase windows physical memory usage and reduce CPU dependance?

Most people on these boards seem to recommend at least 1GB of memory for people getting new machines, but despite my best efforts I cannot use that much. All input would be appreciated.