Task Manager not showing memory, x64

I have 6gb of ram and i am running Vista x64 and in the Task Manager It is only showing 2024mb are available. I have noticed that my computer has been running really slow latley and i wasnt sure why, could this be why? My Computer says i have 6.00gb of ram tho.

Does it recognize the full 6GB in your computer's BIOS? If not, you might have defective memory. If so, you might look to your OS.
 
the memory used to show all 6gb. Here is what my apps are say i have. i think before sp1 it showd all of my memory correctly.
 
my bios show all 6gb of memory so what could the os be doing that it is not using all the memorY?
 
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