High Physical Memory usage on Windows Server 2003x64 vm

I have a number of servers showing a physical memory usage around 98%.  All the servers are 2003x64 standard sp2 virtual machines with 4gb allocated.  I have used process explorer and don't see any processes taking more memory than they should.  The most any one process is using is 100MB and there are 55 total processes running.  I don't see anything that looks strange other than there is no way the sum of all the processes memory usage reaches the 3.9 Gigs process explorer is saying is being used.  I have also tried uninstalling the antivirus software but I don't see any significant change other than the memory that was being used by that process is now free.  Please help.
fcpsAsked:
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LMiller7Commented:
The high memory usage is in the System Cache, as shown in the System Information dialog. On a file server that is the primary use for memory. The working sets of processes is kept low to maximize the system cache. This is usually a good thing because it optimizes the performance of network file sharing - which is what the server is there for. Application performance will suffer but who cares about that on a file server. The situation is very different on a workstation where application performance is the major concern and file sharing is secondary.

If system usage is high this will drive the system cache higher in order to improve performance. But with only 4 GB RAM it has pretty much reached the limit. I don't think there is a problem with the way memory is used, although there may not be enough of it. Of course I have no way of knowing this.

Some other things to consider.

1.Overworked disk system.
2. Overworked CPU.
3. Network issues.

You need to use Performance Monitor to check for what is causing the bottleneck.
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Gerwin Jansen, EE MVETopic Advisor Commented:
You can try Process Explorer if you haven't already.
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fcpsAuthor Commented:
I have looked at process explorer and didnt see anything out of the ordinary
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Gerwin Jansen, EE MVETopic Advisor Commented:
What do you see at the Memory tab of System Information in the lower left corner at Physical Memory?
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LMiller7Commented:
What are you running on the servers?
And is this causing any issues or just a concern?

With SQL this is normal and by design. If nothing else is running on the server this is a usually a good thing. It can be reduced if it is causing a problem.
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fcpsAuthor Commented:
They are just file / print servers, they aren't serving up any other applications.  The memory slowness does cause an issue with responsiveness accessing files on the server.
memory-usage.png
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fcpsAuthor Commented:
after rebooting the pc, the available ram has cleared up and usage has dropped significantly.  By about 3 gigs.  Is it possible a program is having a memory leak?
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LMiller7Commented:
A memory leak is always a possibility but that is doubtful here. A memory leak is almost certain to appear in the Private Bytes column and there is nothing unusual there. The big user of memory here is in the system cache and that is normal in a file server.
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