Windows is paging even though there is plenty of RAM available?

I have a server running SQL Server 2000 Enterprise Edition with a large database (350GB).  The server has 4GB of RAM.  I monitor this server with a 3rd party performance monitoring tool.  Very often I notice that Windows is paging and there is still free memory (about 1.6GB).  I thought that Windows would not start paging until it ran out of Physical Memory, but yet it does so quite consistently when there is still plenty of memory left on the server.   Can anyone give me reasons why this would be happening?

Thanks
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BillPowellAsked:
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Rob SiddellConnect With a Mentor Community Educator IICommented:
When legacy OS's would max out the ram or try to use more than was there it would crash the system so i'm guessing it is a precautionary measure. I believe some applications specifically use paged memory for certain things as i know i've had programs that require it to be enabled. Typically it might store infrequently accessed variables in paged memory to prevent a program from hogging all the resources which would allow their program to run on lower end computers. I hope this sheds some light on your question but let me know if you need to know anything else.
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Rob SiddellCommunity Educator IICommented:
unless you go into the system properties of the machine and tell it to disable the page file it will always utilize it no matter how little ram is in use.
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BillPowellAuthor Commented:
But why would it not exhaust the physical ram first?
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