sorry daddog, i've developed a habit of using the term physical memory around here because those are the words used to identify how much ram the system has in the task manager and the system hardware information panel.
you have enough ram on that system unless you plan on running a lot of different programs while gaming. your paging file allocation size seems a bit low though. i think the general rule of thumb is min=1/2 physical memory and max=1.5 times physical memory, not absolutely sure about the numbers but you really do not want windows to manage the paging file allocation.
when you do a fresh boot, before doing anything else, run task manager and look at the performance tab...that will show you how much of your physical memory is being used before starting any programs. the memory usage should be less 900 megabytes or less after a fresh boot with your anti-virus turned off. to get it lower, you're going to have to disable some advanced services that most people don't use anyway. skuzzy has a decent list in the technical support section under "vista performance hints and tips", and there are several other respected sources on the web that will give you a full list with descriptions.