>Can anybody explain to me,
Could it be:
You have 4GB of installed RAM but the BIOS has reserved everything above 3GB as IO address space for your graphics card and anything else on the PCI bus so your Total Physical Memory is 3GB.
The Windows kernel, device drivers, shared libraries, service processes and running applications have grabbed most of your 3GB Physical Memory so Windows has left you with 1GB of Available Physical Memory.
You have 3GB of swap space so Total Virtual is Physical plus swap - 6GB.
Available Virtual is Available Physical plus unallocated swap space. 3.26GB implies that you have 740MB of swap that is already in use.
I know next to sod all about Windows internals but I expect MS will have (ahem) adopted features from their competitors and now use paging rather than swapping so that 740MB will be data that hasn't been accessed for a while.
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