"Low system resources" message with 6gb of ram.... tips?

This message appears at the most likely of times, when I'm playing a game but as the title says I have 6 gb (three 2gb sticks of corshair ddr3 1600mhz) ram although the problem is not isolated only to games but happens sometimes when watching netflix. When the message appears my desktop theme is changed to simple. This problem is persistant even though I specify to not switch to basic when this happens. I have 6 gb of virtual memory with over 75 gb of free space on my single 300 gb 7200 rpm hdd. Before starting my game I usually have between 4-4.5 gb of ram free. I am on windows 7 64 bit. I haven't found this to be an issue on the forums so any tips or suggestions are much appreciated!

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