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6GB RAM installed, only 4GB usable - 64-bit OS
I've read a number of threads on this topic and have the same problem, but mine seems to be intermittent.
I was recently advised to reseat the memory modules and having done that (about 2 weeks ago) System Properties reported 6.00 GB usable, as expected, and my system was running great.
Yesterday it was back to sluggish, and when I looked at the Properties it again says 6.00 GB (4.00 GB usable).
My system specs are in the drop-down below - any advice would be much appreciated.